Ebony and Ivory McCartney filmed a promotional interview for the "Tug of War" album. The b-side of the single, the song "Rainclouds", is written by Paul McCartney and Denny Laine, though on early pressings of the single the song was credited only to McCartney. "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
Paul McCartney and Wings all-star collection of musicians in London in aid of UNICEF and Kampuchean refugees. Also during this tour, a live version of the "McCartney II" track "Coming Up" was recorded in Glasgow and became Wings' sixth US number one hit the following year. Paul McCartney and his family arrived in Japan on 16 January 1980 for the planned eleven-date Wings' concert tour of Japan (due to visit Budokan Hall, Tokyo from 21 to 24 January 1980; Aichi-Ken, Taiiku-Kan, Nagoya on 25–26; Festival Hall, Osaka on 28; Osaka Furitsu-Kan, Osaka on 29; Budokan Hall, Tokyo from 31 January to 2 February 1980).