I have also seen accounts saying Jimi Hendrix played on the practice stage at Woodstock. I don't remember exactly which source this information appreared in. My best guess is Harry Shapiro's biography of Jimi called "Electric Gypsy".
I've been hoping for years that some documentation or tapes would pop up of these practice sessions, but unfortunately nothing ever has. Peace & Pigpen, Robert Battaly [EMAIL PROTECTED]