Musical improvisation (also known as Musical Extemporization) is the creative activity of immediate ("in the moment") musical composition, which combines performance with communication of emotions and instrumental technique as well as spontaneous response to other musicians. ^[1] Thus, musical ideas in improvisation are spontaneous, but may be based on chord changes in Western music.^[2]

Because improvisation is a performative act and depends on instrumental technique, improvisation is a skill. There are musicians who have never improvised and other musicians who have devoted their entire lives to improvisation.^[3]

Contents 1 Historical development in Western music 1.1 Medieval period 1.2 Renaissance period 1.3 Baroque period 1.3.1 Melodic instruments 1.3.2 Keyboard, lute, and guitar 1.3.3 Organ improvisation and church music 1.4 The Classical period 1.4.1 Keyboard improvisation 1.4.1.1 Mozart and Beethoven 1.5 Romantic period 1.5.1 Instrumental 1.5.2 Opera 2 Modern opinions on improvisation in art music 2.1 Theodor Adorno 2.2 Glenn Gould 3 Contemporary improvisation 3.1 Jazz improvisation 3.2 Contemporary classical music 3.3 Jam bands 4 Silent Film Music 5 Pop Rock Music 6 Notes 7 References 8 See also 9 External links 9.1 Articles 9.2 Books 9.3 Improvisations 9.4 Other

[edit] Historical development in Western music

Throughout the Medieval, Renaissance, Baroque, Classical, and Romantic periods, improvisation was a highly valued skill. Francesco Landini, Adrian Willaert, Diego Ortiz, Frescobaldi, J.S. Bach, Handel, Mozart, Beethoven, Chopin, Liszt, and many other famous composers and musicians were known especially for their improvisational skills. Improvisation might have played an important role in the monophonic period. The earliest treatises on polyphony, such as the Musica enchiriadis (ninth century), make plain that added parts were improvised for centuries before the first notated examples. However, it was only in the fifteenth century that theorists began making a hard distinction between improvised and written music.^[4] Many classical forms contained sections for improvisation, such as the cadenza in concertos, or the preludes to some keyboard suites by Bach and Handel, which consist of elaborations of a progression of chords, which performers are to use as the basis for their improvisation. Handel, Scarlatti, and Bach all belonged to a tradition of solo keyboard improvisation that was not limited to variations, but included the concerto form, typically with moving voices in both hands, occasionally exploring fugue.

[edit] Medieval period

Although melodic improvisation was an important factor in European music from the earliest times, the first detailed information on improvisation technique appears in ninth-century treatises instructing singers on how to add another melody to a pre-existent liturgical chant, in a style called organum.^[5] Throughout the Middle Ages and Renaissance, improvised counterpoint over a cantus firmus (a practice found both in church music and in popular dance music) constituted a part of every musician's education, and is regarded as the most important kind of unwritten music before the Baroque period.^[6]

[edit] Renaissance period

Following the invention of music printing at the beginning of the sixteenth century, there is more detailed documentation of improvisational practice, in the form of published instruction manuals, mainly in Italy.^[7] In addition to improvising counterpoint over a cantus firmus, singers and instrumentalists improvised melodies over ostinato chord patterns, made elaborate embellishments of melodic lines, and invented music extemporaneously without any predetermined schemata.^[8] Keyboard players likewise performed extempore, freely formed pieces.^[9]

[edit] Baroque period

[edit] Melodic instruments

Eighteenth-century manuals make it clear that performers on the flute, oboe, violin, and other melodic instruments were expected not only to ornament previously composed pieces, but also spontaneously to improvise preludes.^[10]

[edit] Keyboard, lute, and guitar

This section may contain original research or unverified claims. Please improve the article by adding references. See the talk page for details. (September 2009)

The pattern of chords in many baroque preludes, for example, can be played on keyboard and guitar over a pedal tone or repeated bass notes. Such progressions can be used in many other structures and contexts, and are still found in Mozart, but most preludes begin with the treble supported by a simple bass. J.S. Bach, for example, was particularly fond of the sound produced by the dominant seventh harmony played over, i.e., suspended against, the tonic pedal tone.^[11]

There is little or no Alberti bass in baroque keyboard music, and instead the accompanying hand supports the moving lines mostly by contrasting them with longer note values, which themselves have a melodic shape and are mostly placed in consonant harmony. This polarity can be reversed—another useful technique for improvisation—by changing the longer note values to the right hand and playing moving lines in the left at intervals—or with moving lines in both hands, occasionally. This shift of roles between treble and bass is another definitive characteristic. Finally, in keeping with this polarity, the kind of question and answer which appears in baroque music has the appearance of fugue or canon. This method was a favorite in compositions by Scarlatti and Handel especially at the beginning of a piece, even when not forming a fugue.^[12]

[edit] Organ improvisation and church music

Improvised accompaniment over a figured bass was a common practice during the Baroque era, and to some extent the following periods. Improvisation remains a feature of organ playing in some church services.

[edit] The Classical period

[edit] Keyboard improvisation

Classical music departs from baroque style in that sometimes several voices may move together as chords involving both hands, to form brief phrases without any passing tones. Though such motifs were used sparingly by Mozart, they were taken up much more liberally by Beethoven and Schubert. Such chords also appeared to some extent in baroque keyboard music, such as the 3rd movement theme in Bach's Italian Concerto. But at that time such a chord often appeared only in one clef at a time, (or one hand on the keyboard) and did not form the independent phrases found more in later music. Adorno mentions this movement of the Italian Concerto as a more flexible, improvisatory form, in comparison to Mozart, suggesting the gradual diminishment of improvisation well before its decline became obvious.^[13]

The introductory gesture of "tonic, subdominant, dominant, tonic," however, much like its baroque form, continues to appear at the beginning of high-classical and romantic piano pieces (and much other music) as in Haydn's sonata Hob.16/No. 52 and Beethoven's sonata opus 78.

Beethoven and Mozart cultivated mood markings such as con amore, appassionato, cantabile, and expressivo. In fact, it is perhaps because improvisation is spontaneous that it is akin to the communication of love.^[14]

[edit] Mozart and Beethoven

Beethoven and Mozart left excellent examples of what their improvisations were like, in the sets of variations and the sonatas which they published, and in their cadenzas. As a keyboard player, Mozart competed at least once with Muzio Clementi.^[15] Beethoven won many tough improvisatory battles over such rivals as Johann Nepomuk Hummel, Daniel Steibelt, and Joseph Woelfl.^[16]

[edit] Romantic period

[edit] Instrumental

Extemporization, both in the form of introductions to pieces, and links between pieces, continued to be a feature of keyboard concertising until the early 20th-century. Amongst those who practised such improvisation were Franz Liszt, Felix Mendelssohn, Anton Rubinstein, Paderewski, Percy Grainger and Pachmann. Improvisation in the area of 'art music' seems to have declined with the growth of recording.^[17]

[edit] Opera

After studying something more than 1,200 early Verdi recordings, Will Crutchfield concludes that "the solo cavatina was the most obvious and enduring locus of soloistic discretion in nineteenth-century opera". ^[18] He goes on to identify seven main types of vocal improvisation used by opera singers in this repertory ^[19]:

• 1. The Verdian “full-stop” cadenza
• 2. Arias without “full-stop”: ballate, canzoni, and romanze
• 3. Ornamentation of internal cadences
• 4. Melodic variants (interpolated hight notes, acciaccature, rising two-note "slide")
• 5. Strophic variation and the problem of the cabaletta
• 6. Facilitations (puntature, simplification of fioratura, etc.)
• 7. Recitative

[edit] Modern opinions on improvisation in art music

[edit] Theodor Adorno

Toward the end of the section of Aesthetic Theory entitled "Art Beauty" (in the English edition), Theodor Adorno included a brief argument on improvisation's aesthetic value. Claiming that artworks must have a "thing-character" through which their spiritual content breaks, Adorno pointed out that the thing-character is in question in the improvised, yet present.^[20] It may be assumed Adorno meant classical improvisation, not jazz, which he mostly excoriated. He held jazz, for example, to be antithetical to Beethoven.^[21] There is more extensive treatment, essentially about traditional jazz, in Prisms and The Jargon of Authenticity.^[22]

[edit] Glenn Gould

Improvisation may be pressed to derive something novel from past material, which becomes outmoded through its limited concepts of tonality, form, and variation. Though his understanding of modern music was itself unorthodox, Glenn Gould appears to have such a view as he clearly thought musical history was a finite exploration of forms and tonal concepts, and exhaustible.^[23]

Despite these beliefs improvisation formed part of Gould's practicing and even recording, in the music of Richard Strauss. The crisis of music theory, however, was one of the primary reasons Gould focused on interpretation as an art in studio recording. In post-baroque music he often found traditional interpretation stale and boring. Gould's technique, which convinced many listeners, became conspicuous in some areas other than Bach and Beethoven. For example, he felt that Mozart could be hackneyed enough, even to cast doubt on the composer's own authority for form and development.^{[citation needed]}

[edit] Contemporary improvisation

[edit] Jazz improvisation

Improvisation is one of the basic tenets of jazz.

Many varied scales and their modes can be used in improvisation.

In the bebop era of jazz in the early 1950s there was a common theme of urgency and technical proficiency. The modal era of jazz moved the harmonic framework for a piece from the fast, dynamic chord progressions of bebop to more static, relaxed chords with longer durations.^{[citation needed]}

Illinois Jacquet, for example, is best known for a single solo on the tune "Flying Home", and such solos are often transcribed.^{[citation needed]} They are often not written down in the process, but they help musicians practice the jazz idiom. Charlie Parker's improvisations were distinctive, helping to shape the bebop period.^{[citation needed]} Another example of a musician who improvises on solo piano is Keith Jarrett (see e.g.The Köln Concert).

[edit] Contemporary classical music

While the first half of the twentieth century is marked by an almost total absence of actual improvisation in art music,^[24] since the 1950s, some contemporary composers have placed fewer restrictions on the improvising performer, using techniques such as vague notation (for example, indicating only that a certain number of notes must sound within a defined period of time). New Music ensembles formed around improvisation were founded, such as the Scratch Orchestra in England; Musica Elettronica Viva in Italy; Lukas Foss's Improvisation Chamber Ensemble at the University of California, Los Angeles; Larry Austin's New Music Ensemble at the University of California, Davis; the ONCE Group at Ann Arbor; the Sonic Arts Group; and Sonics, the latter three funding themselves through concerts, tours, and grants. Significant pieces include Foss's Time Cycles (1960) and Echoi (1963).^[25]

Other composers working with improvisation include Richard Barrett, Pierre Boulez, Cornelius Cardew, Alvin Curran, Stuart Dempster, Hugh Davies, Karlheinz Essl, Vinko Globokar, Richard Grayson, Stephen Nachmanovitch, Pauline Oliveros, Terry Riley, Frederic Rzewski, Karlheinz Stockhausen, Richard Teitelbaum, Christian Wolff, Vangelis, La Monte Young, John Zorn and Yitzhak Yedid.

Several pianists also teach classical improvisation and perform, such as David Dolan,^[26] William Goldstein,^[27] Yitzhak Yedid and Eric Barnhill.^[28]

[edit] Jam bands

The 1960's saw The Grateful Dead gain popularity and bring a name to the "jam" genre. Since the 1980's, bands like Phish, Widespread Panic, moe., Umphrey's McGee, and String Cheese Incident have used musical improvisation extensively; indeed, for the more devoted followers of any band, these extended improvisational segments--jams--are a large part of what makes a live show so special. The jam band scene has also seen the rise of "jamgrass" with bands like Cornmeal and Yonder Mountain String Band, along with the rise of Livetronica with bands like The Disco Biscuits, Lotus, The New Deal, and STS9 (Sound Tribe Sector 9), most of whom feature improvisation very heavily in their music.

[edit] Silent Film Music

In the realm of silent film music performance, there are also a small number of musicians whose improvisational work has been recognized as exceptional by critics, scholars and audiences alike: Neil Brand, Guenter A. Buchwald, Philip Carli, Stephen Horne, Donald Sosin, John Sweeney, and Gabriel Thibaudeau, all performers at the annual conference on silent film in Pordenone, Italy, "Le Giornate del Cinema Muto." Their performances have to match the style and pacing of the films they accompany, often at first sight, and demand a knowledge of a wide range of musical styles, as well as the stamina to play for films which occasionally run over three hours in length without a pause. In addition to the performances, these pianists also teach a master class for those who wish to develop their skill in improvising for films.

[edit] Pop Rock Music

Also in pop music musical improvisation is present. Following the structure of previous jazz forms, from the 1950s onwards the most common example of improvisation in pop and rock is the guitar solo. Other instrumental solos, and collective improvisation are also used.

Psychedelic rock acts of the '60s and '70s used improvisations to express the hallucinations of LSD and other drugs in a musical language^[29]. Bands like Pink Floyd, Led Zeppelin, Allman Brothers Band, Grateful Dead, The Doors, Velvet Underground, Jimi Hendrix Experience,. The progressive rock genre also began exploring improvisation as a musical expression, Henry Cow^[30] The Soft Machine, Robert Fripp, Brian Eno. In the '80s alternative rock, shoegaze, post rock and similar genres used improvisation. Bands like Spiritualized, Yo La Tengo, Sonic Youth, Mogwai, Explosions in the Sky.

Since its origins in the late 1970s, one of the core components of hip-hop has been the ability to come up with impromptu lyrics. This is known as freestyling, and is considered an indication of a person's skills as a rapper. This is particularly true with regards to rap battles, in which MCs must come up with creative, off-the-cuff rhymes to insult their opponent.^{[citation needed]}

This section requires expansion.

Modern electronic instruments or 'groove boxes' allow musicians to perform live sets of endlessly improvised material.

[edit] Notes

[edit] References

• Abert, Hermann, tr. S. Spencer, W. A. Mozart, Yale, 2007 ISBN 9780300072235
• Adorno, Theodor W. 1973. The Jargon of Authenticity, translated by Knut Tarnowski and Frederic Will. Evanston, Ill.: Northwestern University Press. ISBN 0810104075
• Adorno, Theodor W. 1981. Prisms, translated from the German by Samuel and Shierry Weber. Studies in Contemporary German Social Thought. Cambridge, Mass.: MIT Press. ISBN 0262510251 ISBN 026201064X
• Adorno, Theodor W. 1997. Aesthetic Theory, translated by Robert Hullot-Kentor. Minneapolis: University of Minnesota Press. ISBN 0816617996
• Bailey, Derek. 1992. Improvisation: It's Nature and Practice in Music, revised edition. London: British Library National Sound Archive. ISBN 0712305068
• Berliner, Paul. 1994. Thinking in Jazz: The Infinite Art of Improvisation. Chicago: University of Chicago Press. ISBN 0226043800 (cloth); ISBN 0226043819 (pbk.)
• Brown, Howard Mayer. 1976. Embellishing Sixteenth-Century Music. Early Music Series 1. London: Oxford University Press. ISBN 0193231751
• Crutchfield, Will. 1983. "Vocal Ornamentation in Verdi: the Phonographic Evidence". Nineteenth-Century Music 7, no. 1 (Summer): 3–54.
• Crutchfield, Will. 2001. "Improvisation: II. Western Art Music: 5. The Nineteenth Century: (ii) Vocal music". The New Grove Dictionary of Music and Musicians, edited by Stanley Sadie and John Tyrrell. London: Macmillan.
• Czerny, Carl. 1833. L’art de préluder: mis en pratique pour le piano par 120 examples de préludes, modulations, cadenses et fantaisien de tous genres. Paris: M. Schlesinger.
• Dalla Casa, Girolamo. 1584. Il vero modo di diminuir, con tutte le sorti di stromenti di fiato, & corda, & di voce humana. 2 vols. Venice: Angelo Gardano. Facsimile reprint, in one volume, Bibliotheca musica Bononiensis, sezione 2, no. 23 (Bologna: Arnoldi Forni Editore).
• Duckles, Vincent. 1957. "Florid Embellishment in English Song of the Late 16th and Early 17th Centuries". Annales musicologiques 5:329–45.
• Ferand, Ernest T. 1938. Die Improvisation in der Musik; eine Entwicklungsgeschichtliche und Psychologische Untersuchung. Zürich: Rhein-Verlag.
• Ferand, Ernest T. 1956. "Improvised Vocal Counterpoint in the Late Renaissance and Early Baroque". Annales Musicologiques 4 (1956), 129–74.
• Friedrich, Otto. 1989. Glenn Gould: A Life and Variations. New York: Random House. ISBN 039457771X
• Fuller, Sarah. 2002. "Organum, Discantus, Contrapunctus in the Middle Ages". In The Cambridge History of Western Music Theory, edited by Thomas Christensen, 477-502. Cambridge: Cambridge University Press. ISBN 0521623715.
• Ganassi, Silvestro. 1535. Opera Intitulata Fontegara: Laquale insegna a sonare di flauto ch'o tutta l'arte opportuna a esso instrumento massime il diminuire ilquale sara utile ad ogni istrumeno di fiato et chorde: et anchora a chi si dileta di canto. Venice: per Syluestro di Ganassi dal Fontego, Sonator dalla illustrissima signoria di Venetia hautor pprio. Facsimile reprints, Collezione di trattati e musiche antiche edite in fac-simile (Milan: Bollettino bibliografico musicale, 1934) and Bibliotheca musica Bononiensis, Sezione II, no. 18 (Bologna: Forni, 1969). German edition, edited by Hildemarie Peter (Berlin-Lichterfeld: Robert Lienau, 1956). English edition with translation by Dorothy Swainson of Peter's German text (Berlin-Lichterfeld: Robert Lienau, 1959).
• Gorow, Ron. 2002. Hearing and Writing Music: Professional Training for Today's Musician, 2nd ed. Gardena, CA: September Publishing. ISBN 0962949671
• Griffiths, Paul. 2001. "Improvisation §II: Western Art Music 6: The 20th Century". The New Grove Dictionary of Music and Musicians, ed. S. Sadie and J. Tyrrell. London: Macmillan.
• Guido d'Arezzo. 1978. "Micrologus" [ca. 1027], translated by Warren Babb. In Hucbald, Guido, and John on Music: Three Medieval Treatises, edited, with introductions, by Claude V. Palisca; index of chants by Alejandro Enrique Planchart, 57–83. Music Theory Translation Series 3. New Haven and London: Yale University Press. ISBN 0300020406
• Hall, Lucy. 2002. "They're Just Making It Up—Whatever Happened to Improvisation in Classical Music?" The Guardian 22 February
• Hamilton, Kenneth, After the Golden Age: Romantic Pianism and Modern Performance, Oxford, 2008 ISBN 978015178265
• Heartz, Daniel. 1958–63. "The Basse Dance, Its Evolution Circa 1450 to 1550". Annales Musicologiques 6:287–340.
• Horsley, Imogene. 2001. "Improvisation II: Western Art Music 2: History to 1600". The New Grove Dictionary of Music and Musicians, ed. S. Sadie and J. Tyrrell. London: Macmillan.
• Hotteterre, Jacques-Martin. 1719. L’art de préluder: sur la flûte traversière, sur la flûte à bec, sur le hautbois et autres instrumens de dessus, op. 7. Paris: Boivin. Facsimile reprints: recueillie par Michel Sanvoisin (Paris: A. Zurfluh, 1966), (Geneva: Minkoff, 1978) ISBN 2826606727, and Archivum musicum: L’art de la flûte traversière 55 (Florence: SPES, 1999). ISBN 8872427797 Musical pieces edited by Erich Doflein and Nikolaus Delius as 48 Préludes in 24 Tonarten aus op. VII, 1719, für Altblockflöte (Querflöte, Oboe). Mainz: B. Schott’s Söhne; New York: Schott Music Corp., 1972.
• Kertz-Welzel, Alexandra. 2004. "Piano Improvisation Develops Musicianship." Orff-Echo 37, no. 1:11–14.
• Koenig, Wolf, and Roman Kroitor (prod./dir.). 1959a. Glenn Gould: Off the Record. Film, 30 mins. [Canada]: National Film Board of Canada.
• Koenig, Wolf, and Roman Kroitor (prod./dir.). 1959b. Glenn Gould: On the Record. Film, 30 mins. [Canada]: National Film Board of Canada.
• Kutschke, Beate. 1999. "Improvisation: An Always-Accessible Instrument of Innovation". Perspectives of New Music 37, no. 2. (Summer): 147–62.
• Mozart, Wolfgang Amadeus. 1953. Concerto No. 24 In C Minor for Piano, edited by Franz Kullak. New York: G. Schirmer.
• Nachmanovitch, Stephen. 1990. Free Play: Improvisation in Life and Art. Los Angeles: J.P. Tarcher, Inc.; New York: Distributed by St. Martin's Press. ISBN 0874775787 (cloth); ISBN 0874776317 (pbk); New York: G.P. Putnam's Sons. ISBN 0874776317
• Ortiz, Diego. 1553. Trattado de glosas sobre clausulas y otros generos depuntos en la musica de violones. Nuevamente puestos en Luz (also in Italian, as El primo libro nel quale si tratta delle glose sopra le cadenze et altre sorte de punti in la musica del violone). 2 vols. Rome: Dorico. Facsimile reprint of the Italian edition, Archivum musicum 57 (Florence: Studio per edizioni scelte, 1984). Transcription, edition, and German translation by Max Schneider (Kassel: Bärenreiter, 1936).
• Polk, Keith. 1966. "Flemish Wind Bands in the Late Middle Ages: A Study of Improvisatory Instrumental Practices". Ph.D. dissertation. Berkeley: University of California.
• Schopenhauer, Arthur. 1958. The World as Will and Representation. Translated from the German by E. F. J. Payne, 2 vols. [Indian Hills, Colorado]: Falcon's Wing Press.
• Thomas de Sancta Maria, fray. 1565. Libro llamado Arte de tañer fantasia: assi para tecla como para vihuela, y todo instrumento, en que se pudiere tañer a tres, y a quatro vozes, y a mas ... Elqual por mandado del muy alto Consejo real fue examinado, y aprouado por el eminente musico de Su Magestad Antonio de Cabeçon, y por Iuan de Cabeçon, su hermano. Valladolid: F. Fernandez de Cordova. Facsimile editions: with an introduction in English by Denis Stevens (Farnborough, UK: Gregg International Publishers, 1972) ISBN 0576282294; Monumentos de la música española 75, edited by Luis Antonio González Marín, with the collaboration of Antonio Ezquerro Estaban, et al. (Barcelona: Consejo Superior de Investigaciones Científicas, Institución "Milà i Fontanals," Departamento de Musicología, 2007). ISBN 9788400085414 ISBN 8400085418 English translation by Warren E. Hultberg and Almonte C. Howell, Jr, as The Art of Playing the Fantasia (Pittsburgh, Pa.: Latin American Literary Review Press, 1991) ISBN 0935480528
• Solomon, Maynard, Beethoven, Schirmer, 2001. ISBN 0825672686
• Von Gunden, Heidi. 1983. The Music of Pauline Oliveros. Metuchen, NJ: Scarecrow Press. ISBN 0-8108-1600-8.

[edit] See also

• Jam session
• Free improvisation
• Improvisation in music therapy
• Impro-Visor (software)
• Indian Classical Music
• Comparative View of Jazz and Indian Classical Music
• List of free improvising musicians and groups
• Musical collectives
• Musics (magazine)
• Prepared Piano
• Prepared guitar

[edit] External links

[edit] Articles

• Improvise Intentionally (Part 2) Learn to Improvise the Way You Learned to Talk by Keith Hill
• Improvisation Articles by William Harris (Prof. Em. Middlebury College)
• Improvisation and the Classical Musician (classicalimprov.com) Blog and book-in-progress by cellist Eric Edberg
• Robert Levin on Improvisation in Classical Music
• Losing Control: Indeterminacy and Improvisation in Music Since 1950: by Sabine Feisst
• Improvisation on Improvisation: Karlheinz Essl and Jack Hauser talking about musical improvisation with computers
• How to Improvise Jazz Melodies, by Bob Keller
• A Jazz Improvisation Primer by Marc Sabatella Information about jazz improvisation.
• iwasdoingallright:Learning to Improvise Several articles discussing the challenges most people face with jazz improvisation. Includes free online ear training tools with jazz improvisation exercises.
• Jazz improvisation theories Harmony, theories and techniques on jazz improvisation by Italian pianist and songwriter Musilosophy.

[edit] Books

• Extempore playing : forty lessons in the art of keyboard composing (1922) by Alfred Madeley Richardson (1868-1949)
• First lessons in extemporizing on the organ (1922) by Hamilton Crawford Macdougall (b. 1858)
• The Art Of Improvisation by T. Carl Whitmer
• Practical instructions in harmony, upon the Pestalozzian or inductive system; teaching musical composition and the art of extemporizing interludes and voluntaries (1855) by Artemas Nixon Johnson (1817-1892)
• Music as a language: lectures to music students by Ethel Home

[edit] Improvisations

• The Daily Improvisation Blog of improvised music and articles by pianist and Dalcroze teacher Eric Barnhill
• DailyImprov.net - Daily Solo Piano Improvisations Structured and freeform piano improvisation, updated every day.

[edit] Other

• International Society for Improvised Music
• Music for People catalyst in gathering people together to play and sing by creating safe environments in which they can explore music improvisation
• Instituto de Educación Musical Emilio Molina(Spanish) Pedagogical uses of improvisation
• How to Improvise Around the Circle of Fifths Video explaining the circle of fifths and how to use it to improvise Jazz piano with.