Yes, the Grateful Dead played "Turn On Your Love Light" at Woodstock in 1969 for such an epic length that it took up almost half of their 95-minute set. The song, which is a cover of Bobby "Blue" Bland's 1961 hit, was a staple of the Grateful Dead's live performances and often featured extended improvisational jams. At Woodstock, their version of "Turn On Your Love Light" lasted for over 30 minutes and is considered one of the highlights of their performance at the legendary festival.