Sandy Bull is rightfully ranked alongside John Fahey and Robbie Basho as one of the most revolutionary American acoustic guitarists of the folk revival. But in spirit, Bull's closest kin was British guitarist Davy Graham, with whom he shared a fondness for non-Western tunings and unconventional instruments. Bull also had little time for rigid folk orthodoxy: Over the course of his career, he adapted source material from J.S. Bach, Carl Orff, bossa nova pioneer Luiz Bonfá and Chuck Berry. Bull's recording career was sporadic, releasing only seven albums between 1963 and his death in 2001.