Bill Graham was a German-American impresario and rock concert promoter.
Bill Graham, circa 1990
Graham in 1974
Chester Leo "Chet" Helms, often called the father of San Francisco's 1967 "Summer of Love," was a music promoter and a counterculture figure in San Francisco during its hippie period in the mid- to-late 1960s.
Chet Helms Memorial – Speedway Meadows, Golden Gate Park, San Francisco, October 30, 2005