trio

A piano trio is a group of piano and two other instruments, usually a violin and a cello, or a piece of music written for such a group. It is one of the most common forms found in classical chamber music. The term can also refer to a group of musicians who regularly play this repertoire together; for a number of well-known piano trios, see below.
The term "piano trio" is also used for jazz trios, where it most commonly designates a pianist accompanied by bass and drums, though guitar or saxophone may figure as well.

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