I'm listening to the concert that was just posted. Quicksilver was overlooked and rally undiscovered by the mainstream music machine. God, those guys were incredible. I saw them so many times. Free in the Park, at the Avalon and Fillmore West. Cipollina was a shaman, a guitar wizard.
I keep saying this over and over. Recordings are just a snapshot in time. People can't possibly know how heavy this stuff was way back then. My favorite performance was with the Dead, Youngbloods at the Family Dog at the Beach.