"Mamma Mia" is a song by the Swedish pop group ABBA, written by Benny Andersson, Björn Ulvaeus and Stig Anderson, with the lead vocals shared by Agnetha Fältskog and Anni-Frid Lyngstad. It is the opening track on the group's third album, the self-titled ABBA (1975). The song was released in September 1975 as its sixth single. The song's name is derived from Italian, where it is an interjection used in situations of surprise, anguish, or excitement. It corresponds to the English interjection "my, my!" (which can indeed be found in some lines within the song) The song was ABBA's first number one in the UK since "Waterloo" in 1974.