Excerpts from Books and Wikipedia
"Ebony and Ivory" spent seven weeks at No. 1 on the Billboard Hot 100, and was the fourth-biggest hit of 1982. For McCartney, the song's run atop the chart was the longest of any of his post-Beatles works, and second longest career-wise (behind "Hey Jude" with The Beatles); for Wonder, it was his longest-running chart-topper. It marked the first time that any single released by any member of the Beatles hit the Billboard R&B chart. It was McCartney's record 28th song to hit number one on the Billboard 100." [Wikipedia]