Formed in Stockholm in 1972, ABBA have sold millions of disco records worldwide. The synth-heavy four-piece won Eurovision in 1974 with their song Waterloo. Named after the two singer/composer couples - Agnetha, Björn, Benny and Anni-Frid - the pop maximalists dominated the charts in the 1970s and 80s, and provided the inspiration for the Mamma Mia! musical and subsequent film.

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