The third chord in this example is built on the leading-tone (vii^o) and found here in the circle progression on C: I-IV-vii^o-iii-vi-ii-V-I Play (help·info)

In music theory, a leading-note (called the leading-tone in the US) is a note or pitch which resolves or "leads" to a note one semitone higher or lower, being a lower and upper leading-tone, respectively.

	Leading tone in V-I progression Leading tone repeats four times over dominant (V) chord which then moves to the tonic (I) as the leading tone resolves upwards to the tonic
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Generally, the leading note is the seventh tonal degree of the diatonic scale leading up to the tonic. For example, in the C major scale (white keys on a piano, starting on C), the leading note is the note B; and the leading note chord uses the notes B, D, and F: a diminished triad. In music theory, the leading note triad is symbolized by the Roman numeral vii°.

Tritone substitution, ii-subV-I on C, creates an upper leading-note (D♭, which leads down to C) play (help·info)

According to Ernst Kurth (1913) the major and minor thirds contain "latent" tendencies towards the perfect fourth and whole-tone, respectively, and thus establish tonality. However, Carl Dahlhaus (1990) shows that this drive is in fact created through or with harmonic function, a root progression in another voice by a whole-tone or fifth, or melodically (monophonically) by the context of the scale. For example, the leading note of alternating C chord and F minor chords is either the note E leading to F, if F is tonic, or A♭ leading to G, if C is tonic. In the 14th and 15th centuries, the leading-note is created by the progression from imperfect to perfect consonances, such as a major third to a perfect fifth or minor third to a unison. The same pitch outside of the imperfect consonance is not a leading note.

As a diatonic function the leading-note is the seventh scale degree of any diatonic scale when the distance between it and the tonic is a single semitone. In diatonic scales where there is a whole tone between the seventh scale degree and the tonic, such as the Mixolydian mode, the seventh degree is called instead, the subtonic.

The thriller/horror film Jaws contains a well known leading tone leitmotif, E-F, to represent the shark and suspense associated with it.

[edit] Sources

• Dahlhaus, Carl. Gjerdingen, Robert O. trans. (1990). Studies in the Origin of Harmonic Tonality, p.184-5. Princeton University Press. ISBN 0-691-09135-8.
• Kurth, Ernst (1913). Die Voraussetzungen der theoretischen Harmonik und der tonalen Darstellungssysteme, p.119ff. Bern.