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Difino
| • | A harmonica is a very common free reed musical wind instrument (also known, among other things, as a mouth organ, French harp, blues harp, simply harp, or "Mississippi saxophone"), having multiple, variably-tuned brass or bronze reeds, each secured at one end over an airway slot of like dimension into which it can freely vibrate, thus repeatedly interrupting an airstream to produce sound.
Unlike most free-reed instruments (such as reed organs, accordions and melodicas), the mouth harmonica lacks a keyboard. Instead, lips and tongue are used to select one or a few of the several holes arranged usually linearly on a mouthpiece. Each hole communicates with one, two or a few reeds. Because a reed mounted above a slot is made to vibrate more easily by air from above, reeds accessed by a mouthpiece hole often may be selected further by choice of breath direction (blowing, drawing). Some harmonicas (primarily chromatic harmonicas) also include a spring-loaded button-actuated slide that, when depressed, further redirects air blown or drawn through a single hole, from one reed to an adjacent reed, usually a semi-tone sharper.
The harmonica is commonly used in blues and folk music, but also in jazz, classical music, country music, rock and roll and pop music.
Source: [wikipedia: harmonica]
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