Actually this isn’t a parody so much as it’s satire. National Lampoon editor Tony Hendra used actual quotes from John Lennon’s infamous 1970 Rolling Stone interview with Jann Wenner (later published as Lennon Remembers) for this hysterical bit.
At the time of Lennon’s Rolling Stone sitting he was undergoing Primal Scream therapy with Dr. Arthur Janov and he really let it rip, shitting on his own fans, Mick Jagger, Paul and Linda McCartney and several others. All Hendra did was handpick the best parts and arrange them into lyrics. Still as funny today as when it was released on the classic Radio Dinner LP in 1972.
Hendra (who played Spinal Tap’s manager) does the boffo Lennon impersonation here, razzing the former Beatle’s very public bitching and moaning. The music’s by Chris Cerf and that’s Melissa Manchester making a cameo appearance as Yoko at the very end.