From the National Lampoon Lemmings album (1973), a hilarious goof on Woodstock.
This in particular is a goof on Crosby, Stills, Nash, and Young and their song “Woodstock.” I think you can see Belushi in back there somewhere on bass or rhythm guitar. The Youtube person, amazingly, synced the CD of the album with the “lost” VHS tape of the Lemmings concert.