Harmonica

A harmonica is a very common free reed musical wind instrument (also

Harmonica types

The diatonic harmonica

The diatonic harmonica is most likely what you think of when you think

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of a "harmonica." It has ten holes which offer the player 19 notes

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(10 holes times a draw and a blow for each hole minus one repeated

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note) in a three octave range. The standard diatonic harmonica is

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designed to allow a player to play chords and melody in a single key.

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Because they are only designed to be played in a single key at a time,

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diatonic harmonicas are available in all keys. Here is a standard

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diatonic harmonica's layout in the key of C (1 blow is middle C):

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1 2 3 4 5 6 7 8 9 10

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