Harmonica
DEFINITION
An instrument, also called the " mouth organ ", which consists of reeds in a casing which channel the air blown into the instrument through channels and out holes on the side of the instrument. The harmonica was invented in 1821 and is used mostly in folk music.Harmonicaa wind-blown instrument consisting of a casing containing a series of metal reeds. it is played principally in popular and folk music, including the blues