A mouth organ is any of several types of musical instruments played by blowing air through a pipe or tube, generally consisting of multiple tubes connected together. Notable variations include the harmonica, the pan flute, and Asian free reed wind instruments consisting of a number of bamboo pipes of varying lengths fixed into a wind chest; these include the sheng, khaen, lusheng, yu, shō, and saenghwang. The melodica, consisting of a single tube that is essentially blown through a keyboard, is another variation.

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