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SAN FRANCISCO - FEBRUARY 1970: The Grateful Dead (L-R Ron 'Pigpen' McKernan, Jerry Garcia, Bill Kreutzmann, Phil Lesh and Bob Weir) perform onstage at The Family Dog in Febuary 1970 in San Francisco, California. (Photo by Robert Altman/Michael Ochs Archives/Getty Images)

SAN FRANCISCO - FEBRUARY 1970:  The Grateful Dead (L-R Ron 'Pigpen' McKernan, Jerry Garcia, Bill Kreutzmann, Phil Lesh and Bob Weir) perform onstage at The Family Dog in Febuary 1970 in San Francisco, California.    (Photo by Robert Altman/Michael Ochs Archives/Getty Images)