"Goodnight Tonight" is Wings' disco-inflected single which included a spirited flamenco guitar break. It peaked at number five in both the United Kingdom and United States during 1979. The track did not appear on Wings' then-current LP Back to the Egg (from which sessions this song was recorded.
"Goodnight Tonight" began as an instrumental backing track McCartney had recorded in 1978. Needing a single for Wings to accompany the Back to the Egg album, McCartney took out the track and brought it into the studio, where the full Wings line-up completed it. Since the track was over seven minutes long, an edited version was used as the single, with the full version available as a 12-inch single. A music video was made for the song, showing Wings performing in 1930s costumes; stills from the video were used on the single's sleeve. In the US, the single was the first released under McCartney's new deal with Columbia Records. In the UK, it was McCartney's first post-Beatle release on Parlophone.
"Goodnight Tonight" was an international hit, reaching number five on the Billboard Hot 100 as well as the UK Singles Chart. John Lennon, McCartney's former songwriting partner, later commented that he did not care for the song, but enjoyed McCartney's bass guitar on the single. The single was certified Gold by the Recording Industry Association of America for sales of over one million copies.