Odd facts I've just discovered about 'Yesterday' by the Beatles: although credited to Lennon and McCartney, it is in fact only by Paul. Furthermore, though the recording is credited to the Beatles, it is performed only by Paul, with backing musicians. It is one of the most covered songs ever, which is in line with my own experience: back in 1965, when it was released, I heard a cover version by Frank Sinatra, and another by someone else, before I finally heard the Beatles'/Paul's version. I discovered all that after reading the Wikipedia entry on the Beatles after watching the film 'Yesterday' yesterday on iplayer.