There have been 1383 UK chart single number 1s since 1952.
A duet between Paul McCartney and Stevie Wonder, this is a song about racial harmony, using piano keys as a metaphor. The black keys on a piano are ebony, and the white ones are ivory - the song asks why we all can't lie together in perfect harmony like the keys. Paul McCartney wrote this song, saying that the message was "that people of all types could live together."
More songs from the same decade.