The Beatles will release an obscure album track - "Hey Bulldog" - as their final single.
Recorded in February 1968 with John Lennon on lead vocals, "Hey Bulldog" was written and recorded for the band's fourth film, Yellow Submarine.
But the film sequence over which the song was supposed to be played was left on the cutting room floor.
The song eventually appeared on the Yellow Submarine album, which was released in January 1969.
The single will be re-released worldwide on 14 September, with a 15-track repackaged edition of Yellow Submarine.
The album's original seven instrumentals written by producer George Martin for the B side - will be axed in favour of nine other Beatle originals, including "Sgt. Pepper's Lonely Hearts Club Band", "Eleanor Rigby", "Nowhere Man" and "Think For Yourself".
The three remaining Beatles - Sir Paul McCartney, George Harrison and Ringo Starr - last worked together four years ago to produce the Beatles Anthology series, which featured new singles "Free As A Bird" and "Real Love".
Those singles were based on unfinished songs by Lennon, who was shot dead by a deranged fan in New York in 1980.
A digitally restored, 24-bit stereo Yellow Submarine film - complete with extra footage - is scheduled for cinema and video release by MGM this year.
The world premiere of the psychedelic, feature-length cartoon - at the London Pavillion on 17 July, 1968 - was attended by all four Beatles.
British newspaper The Sun reported yesterday McCartney, Starr and Harrison were also planning a Beatle tribute concert, rumoured to include Boyzone and Robbie Williams.