More than forty years after first appearing on Sgt. Pepper's Lonely Hearts Club Band, the Beatles' epic "A Day in the Life" made its debut live performance at a Paul McCartney concert in Liverpool this weekend. Following a run through "Yesterday," the opening chords of "A Day of the Life" were strummed, and McCartney launched into the verses previously sung by John Lennon while Lennon's widow Yoko Ono watched from the crowd. The song's long delay to the live stage was apparent as McCartney accidentally sang his own "Made the bus in seconds flat" line twice before segueing into Lennon's "Give Peace a Chance." Watch a clip from "A Day in the Life" above.