The Beatles' 'BACK' is a song from their 1965 album Rubber Soul. It was written by Paul McCartney and John Lennon, and features McCartney on lead vocals. The song is an upbeat rocker with a catchy chorus and a memorable guitar riff. It has become one of the band's most popular songs and is often performed in concert. The song is about looking BACK on life and reflecting on the past. It is a reminder to appreciate the present and look forward to the future.