Bossa nova
Classical guitar

Bossa nova is most commonly performed on the nylon-string classical guitar, played with the fingers rather than with a pick. Its purest form could be considered unaccompanied guitar with vocals, as created, pioneered, and exemplified by João Gilberto. Even in larger, jazz-like arrangements for groups, there is almost always a guitar that plays the underlying rhythm. Gilberto basically took one of the several rhythmic layers from a samba ensemble, specifically the tamborim, and applied it to the picking hand. According to Brazilian musician Paulo Bittencourt, João Gilberto, known for his eccentricity and obsessed by the idea of finding a new way of playing the guitar, sometimes locked himself in the bathroom, where he played one and the same chord for many hours in a row.
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