In music, a riff is an ostinato figure: a repeate chord progression, pattern, refrain or melodic figure, often played by the rhythm section instruments, that forms the basis or accompaniment of a musical composition (though they are most often found in rock music, Latin, funk and jazz). Classical music is also sometimes based on a simple riff, such as Ravel's Boléro. Riffs can be as simple as a tenor saxophone honking a simple, catchy rhythmic figure, or as complex as the riff-based variations in the head arrangements played by the Count Basie Orchestra.