Saturday Was Rainy at Woodstock
A mix of folky acoustic and searing electric lasted til the next morning
Rain delays required unscheduled acoustic guitar performances by Country Joe McDonald and John Sebastian, the latter there as an audience member but recruited to help out.
But then a band known only in San Francisco took the stage at 12:30 pm. Named for leader Carlos Santana and reputedly tripping on LSD and in front half a million people, they ended their set with one of the pinnacle performances in rock history, instantly vaulting Santana and 20 year old drummer Michael Shrieve into rock immortality.