"Goodnight Tonight" is Wings' disco-inflected single which included a spirited flamenco guitar break. It peaked at number five in both the UK and US during 1979. The track did not appear on Wings' then-current LP Back to the Egg (from which sessions this song was recorded), and was finally released on an album as a bonus track on the 1993 reissue of McCartney II. The B-side of this single was "Daytime Nighttime Suffering". An extended version of the song appears on a digital iTunes re-issue of Back to the Egg.