Which of these bands or musicians did not perform at Woodstock?

The Doors didn't participate in the Woodstock Music and Art Fair, commonly referred to as Woodstock. They were invited but purportedly turned the invitation down because of their lead singer/songwriter/composer's dislike for outdoor venues. Their drummer, John Densmore, did appear at the festival.

Billed as "an Aquarian Exposition: 3 Days of Peace & Music" and also called the Woodstock Rock Festival, it attracted more than 460,000 attendees.Thirty-two acts performed outdoors despite overcast and sporadic rain. It was one of the largest music festivals in history and became synonymous with the counterculture of the 1960s.