Harmonica, (English Harmonica), blow or inhale with the mouth , a multi-reed instrument that makes metal reeds vibrate and produce sound; it is a free-reed wind instrument in terms of musical instrument classification. The sound source is a reed with a length between 1.5 and 3.5cm rather than an air column (such as a flute).
Harmonicas are mainly divided into solo harmonicas and ensemble harmonicas, each of which has different types. Its vocal range varies slightly depending on the type and tonality. As a melodic instrument, the harmonica can play at least two chords, and advanced players can play two relatively independent parts at the same time while following the harmonica structure. It is called the "piano in your pocket" because of its compact size.
