Todd S. Jenkins' handy encyclopedia of free music reflects upon the personalities, styles, organizations, philosophy and politics of a musical form to which too little prior attention has been devoted. Directing readers to outstanding recorded performances, it serves as an essential introduction to this difficult but rewarding music, offering a scholarly historical and cultural overview that provides a critical assessment of one of the most misunderstood periods in American music. Filling many gaps left in previously published literature on the subject, Jenkins's work is a necessary addition to the shelves of music libraries and the collections of jazz aficionados alike.