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A jazz band (or
jazz ensemble) is a musical ensemble that plays jazz music usually
without a conductor. Jazz bands usually consist of a rhythm section and
a horn section. During the jazz and swing eras in the mid-twentieth
century, the most successful jazz orchestras also employed strings and
harp in expanded arrangements, but their presence on the bandstand was
more for visual impact and not as a key component of the ensemble,
although the unique timbres of the strings and harp combined with the
band as a whole provided an extra layer of ear-pleasing sonorities.

The rhythm section
of a jazz band consists of the percussion, double bass or bass guitar, and usually at least one instrument capable of playing chords, such as
a piano, guitar, Hammond organ or vibes. most will usually have more
than one of those. The rhythm section is the foundation for the band;
it sets the feel for the piece.

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