ABBA

ABBA was a Swedish pop music group formed in Stockholm in 1972, consisting of Anni-Frid "Frida" Lyngstad, Björn Ulvaeus, Benny Andersson and Agnetha Fältskog. Fältskog and Ulvaeus were a married couple, as were Lyngstad and Andersson during their career, although both couples later divorced. They became one of the most commercially successful acts in the history of popular music, and they topped the charts worldwide from 1972 to 1982. They gained international popularity employing catchy song hooks, simple lyrics, sound effects (reverb, phasing) and a Wall of Sound achieved by overdubbing the female singers' voices in multiple harmonies. ABBA remains a fixture of radio play lists and is one of the world's best-selling bands, having sold over 375 million records worldwide, making them the fourth best-selling popular music artists in the history of recorded music. They still sell two to three million records a year