| Harmonica Article | A harmonica is a free reed wind instrument. It has multiple, variably-tuned brass or bronze reeds which are secured at one end over an airway slot in which they can freely vibrate. The vibrating reeds repeatedly interrupt the airstream to produce sound. Unlike most free reed instruments (such as reed organs, accordions, and melodicas), the harmonica lacks a keyboard - instead, the player selects the notes to be played by placing the mouth over the proper airways, usually discrete holes in the front of the instrument. Each hole communicates with one or more reeds, depending on the type of harmonica. 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 the chromatic harmonica, also include a spring-loaded button-actuated slide that, when depressed, redirects the airflow. The harmonica is most commonly used in blues and folk music, but is also used in jazz, classical music, country music, rock and roll, and pop music. Increasingly, the harmonica is finding its place in more electronically generated music, such as dance and hip-hop, as well as funk and acid jazz. The harmonica has many nicknames, especially in blues music, including: harp, blues harp, mouth harp, hand reed, Mississippi saxophone, pocket sax, tin sandwich, and ten-holed tin-can tongue twister
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