When Swedish musicians Bj n Ulvaeus and Benny Andersson invited their partners Agnetha F tskog and Anni-Frid Lyngstad to sing backing vocals on some tracks, they were quite pleased with the results, but could not have dreamed how successful this new direction would be. 　　
After adopting the name ABBA, formed from the initials of the 4 members' first names, victory in Brighton in the 1974 Eurovision Song Contest 　　
propelled the band to international stardom. 'Number Ones' is the latest collection of their hit songs, which list as favourites to musical luminaries as varied as Madonna and Scissor Sisters' Jake Shears, to Bono and Noel Gallagher.