ABBA's self-titled third album was the one that really broke the group on a worldwide basis. The Eurovision Song Contest winner "Waterloo" had been a major international hit and "Honey, Honey" a more modest one, but ABBA was still an exotic novelty to most of those outside Scandinavia until the release of ABBA in the spring of 1975. "I Do, I Do, I Do, I Do, I Do," a schmaltzy tribute to the sound of '50s orchestra leader Billy Vaughn, seemed an unlikely first single, and indeed it barely scraped into the Top 40 in the U.K. But in Australia, it topped the charts, causing the Australian record company to pull its own second single, "Mamma Mia," off the album. This far more appealing pop/rock number followed its predecessor into the pole position Down Under and also topped the charts througho...