This new volume in the renowned series of reference works by Leonard Feather shows that jazz in the sixties is conspicuously different from jazz of any other period in the fast-moving history of this unique American art. The performances are almost limitlessly diversified. For many listeners it is hard to understand that the same term denotes both the folk music of a Texas blues singer and the explorations of an avant garde pianist. Yet both are jazz and both are a part of the jazz of the sixties, the most turbulent period in jazz annuals. There are 1100 biographies and 200 photographs.