Entitled Now And Then, the single is based on a John Lennon recording given to McCartney by the late musician\'s widow Yoko Ono.

Sunday Express reports that the plan is to have Ringo Starr drumming on the track, and to lift a George Harrison performance from The Beatles archives, to make sure that the Fab Four have been reunited for the release of the new single.

Jeff Lynne, singer and guitarist for Electric Light Orchestra (ELO), produced the track\'s original sessions. Lynne says:

\"The song had a chorus but is almost totally lacking in verses. We did the backing track, a rough go that we really didn\'t finish. It was sort of a bluesy sort of ballad, I suppose, in A minor. It was a very sweet song; I liked it a lot, and I wish we could have finished it.\"

In related news: Paul McCartney will also release a new album, \"Memory Almost Full\", in June to coincide with the 40th anniversary of The Beatles’ \"Sgt Pepper’s Lonely Hearts Club Band\" album.