Song written by Benny Andersson and Bjorn Ulvaeus and performed by Abba in 1977 on the album 'Abba - The Album'. It's perhaps Abba's most famous song, but when it was finally released on single in 1983, it only reached no. 33 in the UK.
On 13 January 2001, Kim Wilde sang this song as a special guest star in a live show by the Abba tribute band Fabba.