from wikipedia: Harvey Mandel (born 11 March 1945, in Detroit, Michigan) was raised in Chicago. Mandel became the original guitarist with Charlie Musselwhite, releasing the debut album Stand Back! in 1966. As a result of heavy airplay in San Francisco, they were invited to play The Fillmore by Bill Graham. Mandel moved to the Bay Area, regularly performing at the infamous club "The Matrix", where local favorites like Jerry Garcia, Elvin Bishop and Jefferson Airplane would sit in and jam.