The 7th Annual San Francisco Blues Festival featured, amongst others, Big Mam Thornton, Robert Cray, Jimmy Rogers and a band called Double Trouble featuring Lou Ann Barton and a guitarist name Stevei Ray Vaughan in one of the first important out-of-state gigs. This may have been their first West Coast appearance. A classic Blues Image on this rare silkscreened poster. VG++, a small edge tear.