"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.

[2] According to biographer Carl Magnus Palm, the instrument was incorporated at the last minute, added after Benny Andersson found it in the studio and decided its "tick tock" rhythm was perfect for the track.

[3] "Mamma Mia" was written at the home of Agnetha Fältskog and Björn Ulvaeus, and was the last track recorded for the album ABBA.

[2] Cash Box said the single was "an example of [ABBA's] excellent musical taste," stating that the "tune is upbeat, with characteristically varied textures.

"[6] After this success in Australia, Epic Records in the United Kingdom took notice of ABBA for the first time since their Eurovision Song Contest winner "Waterloo".

From then on, Epic began to heavily promote ABBA's singles with the immediate result of "SOS" reaching the Top 10 in the British market, their first hit since "Waterloo".

Swedish pop group A-Teens released their version of "Mamma Mia" as their debut single on 30 April 1999 through Stockholm Records.

Upon its release, it became a smash hit in Sweden, where it peaked at number one and stayed there for eight consecutive weeks, earning a quadruple platinum certification.

Despite the worldwide success, the song failed to attract the Australian public, peaking at 72 on the ARIA Singles Chart, although it did reach number 13 in New Zealand.