This Swedish foursome's hooky pop is as popular in the new millennium as it was in the group's 1970s heyday.
The name Abba was an acronym for its members: Anni Frid, Benny, Bjorn, Agnetha.
Despite all of the band's worldwide success, "Dancing Queen" remains Abba's only U.S. No. 1.
Abba's youngest member, Agnetha Faltskog, played Mary Magdalene in the Swedish production of "Jesus Christ Superstar."
Abba is also a Swedish fish canning company. The group had to negotiate with the canners for the right to use the name. Find all your favorite ABBA ringtones and ABBA realtones below.