Paul McCartney demo on cassette tape is set to be auctioned off for £10,000.The track which runs for four minutes and two seconds, is a demo version of the former Beatle‘s song ‘Attention’, which featured on Ringo Starr‘s 1981 album ‘Stop And Smell The Roses’.It was given to saxophonist Howie Casey, to reference ahead of the recording session for the record. Casey’s wife Sheila also performed backing vocals on the finished version of the song, alongside Linda McCartney.