Sandy Bull is known for some of the first extended instrumental compositions for guitar that incorporated elements of folk, jazz, and Indian and Arabic-influenced dronish modes. This album, taken from two nights of performances in February 1969 recorded at San Francisco"s legendary Matrix, finds Bull experimenting with guitar electronics, as well as working out on the acoustic instruments that were the mainstay of his Vanguard Records Fantasias and Inventions albums. Packaging features rare photos and detailed liner notes.