A cassette demo by Paul McCartney of "Attention," a song he gave to Ringo Starr, is up for bid via Omega Auctions.
According to The Guardian:
The demo recording by McCartney was given to saxophonist Howie Casey, to reference ahead of the recording session for Starr’s 1981 album Stop and Smell the Roses. Casey’s wife Sheila would also perform backing vocals on the finished version of Attention, alongside Linda McCartney.
Auctioneer Paul Fairweather said: “To hear [McCartney] unaccompanied working through the bones of a song like this is really fascinating and it does give an insight into his startling talent for songwriting.”
Listen to a bit of Paul's recording: