Who sang with Paul McCartney on the 1982 UK number one single 'Ebony and Ivory'?

"Ebony and Ivory" is a 1982 number-one single by Paul McCartney and Stevie Wonder. It was released on March 29 of that year. The song is featured on McCartney's album Tug of War. A self-empowerment hit that tackles issues of racial equality, the song reached number one on both the UK and the U.S. charts. It is also on McCartney's All the Best! hits compilation (1987), and also on the UK two-disc version of Stevie Wonder's The Definitive Collection greatest hits compilation (2002). In 2013, Billboard Magazine ranked the song as the 69th biggest hit of all-time on the Billboard Hot 100 charts.