Ebony and Ivory "Billboard" Hot 100 charts. At the simplest level, the song is about the ebony (black) and ivory (white) keys on a piano, but also deals with integration and racial harmony on a deeper, human level. The title was inspired by McCartney hearing Spike Milligan say "black notes, white notes, and you need to play the two to make harmony, folks!". The figure of speech is much older. It was popularised by James Aggrey in the 1920s, inspiring the title of the pan-African journal "The Keys", but was in use from at least the 1840s. Written by McCartney alone, the song
Paul McCartney and Wings Prairie" was released that featured seven Wings songs written or co-written by her. Wings also backed Paul's brother Mike McGear on the "McGear" album, as well as McGear's band the Scaffold on the single "Liverpool Lou" and its B-side "Ten Years After on Strawberry Jam". Paul McCartney also used three unreleased Wings songs as B-sides of his solo singles several years after Wings' break-up. Wings' 1977 single "Mull of Kintyre"/"Girls School" is still the biggest-selling non-charity single in the UK (although Queen's "Bohemian Rhapsody" sold more, its sales include a reissue in aid of the Terrence Higgins Trust), and it