On Sept. 21, 1974, the Swedish pop quartet's debut U.S. album, 'Waterloo,' peaked at No. 145 on the Billboard 200, but its title track became a smash single.
The world began to fall in love with ABBA in 1974, when the Swedish pop group, which began singing together on a beach vacation in Cyprus four years earlier, won the Eurovision Song Contest with its oh-so-catchy "Waterloo."
The ebullient tune soon became the act's first top 10 hit on the Billboard Hot 100, reaching No. 6 in August. ABBA's two 20-something couples – Agnetha Faltskog and Bjorn Ulvaeus, and Benny Andersson and Anni-Frid (Frida) Lyngstad – later saw the Waterloo album, their first American release, peak at No. 145 on the Billboard 200 dated Sept. 21, 1974.