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Jazz hands. Jazz hands in performance dance is the extension of a performer's hands with palms toward the audience and fingers splayed (this position is also referred to as webbing). It is commonly associated with especially exuberant types of performance such as musicals, cheerleading, show choir, revue, and especially jazz dance shows.
Jazz is a kind of music in which improvisation is typically an important part. In most jazz performances, players play solos which they make up on the spot, which requires considerable skill. There is tremendous variety in jazz, but most jazz is very rhythmic, has a forward momentum called swing, and uses bent or blue notes. You can often hear call--and--response patterns in jazz, in which one instrument, voice, or part of the band answers another.