Dancing Queen

Recording sessions for "Dancing Queen" began on 4 August 1975, with the demo carrying the working title "Boogaloo". As ABBA worked on the track, Benny Andersson and Björn Ulvaeus found inspiration in the dance rhythm of George McCrae's "Rock Your Baby" and in the drumming on Dr. John's 1972 album Dr. John's Gumbo. The opening melody echoes "Sing My Way Home" by Delaney & Bonnie. Agnetha Fältskog and Anni-Frid Lyngstad recorded their vocals in September 1975, and the track was completed three months later.

Andersson brought a tape of the backing track home and played it to Lyngstad, who started crying as she listened. She later said the song went straight to her heart. Fältskog, meanwhile, recalled that it was often hard to predict a hit, but that with this one everyone knew it would be massive. During the writing, the first half of the second verse was scrapped, though it survives in footage from a recording session.

The song premiered on German and Japanese television in spring 1976, and its first live performance came on 18 June 1976 at a gala at the Royal Swedish Opera honouring King Carl XVI Gustaf and his bride-to-be Silvia Sommerlath. Released as a single that August in Sweden, it became ABBA's only number-one hit in the United States and topped the charts of 15 other countries, selling over three million copies. In 2015 it was inducted into the Grammy Hall of Fame.