
In 1974, they were unknowns. A group from Sweden, two men and two women, in bright, outlandish costumes and with a catchy, sunny song that somehow struck the right note at that year's Eurovision Song Contest in Brighton.
Everything changed — for them and popular music as a whole. ABBA’s bright "n" breezy "Waterloo" won by a mile, rocketed to the top of the charts all over Europe and ushered in a phenomenon.