American Psychedelic rock music poster, Earthquake, Bo Diddley and Big Brother and the Holding Company at Avalon Ballroom, 1966. The poster was designed by the pioneering psychedelic rock poster team of Alton Kelly and Stanley Mouse. The central image reproduces a photograph of the Sonoma County Courthouse destroyed by the 1906 San Francisco earthquake. Possibly a second printing from the later 1960s. A higher resolution image is available for viewing on request.