Anni-Frid Lyngstad

Swedish singer Anni-Frid Lyngstad shared lead vocal duties as part of ABBA, one of the most successful pop groups in music history, with over 370 million singles and albums sold worldwide. Lyngstad was the primary vocalist on several of the group's biggest hits, including "Money Money Money" and "Fernando," while also sharing lead vocals with Agnetha Fältskog on "Waterloo," "Dancing Queen," "The Name of the Game" and contributing to ABBA's trademark four-part harmony with her husband, Benny Andersson and his songwriting partner, Björn Ulvaeus. For much of the 1970s, ABBA was massively popular throughout Europe, Australia and Latin America, with the United States coming somewhat late to the party in the latter half of the decade when the group reached its creative apex with the No. 1 sensation "Dancing Queen." Personal turmoil between the two couples and declining stateside interest in all things disco-friendly led to ABBA's breakup in 1982, after which Lyngstad enjoyed solo stardom with the Top 20 single "I Know There's Something Going On" that same year. Subsequent releases failed to match its success, but she traded pop stardom for royalty when she married Prince Henrich Ruzzo Reuss of Plauen in 1992. Though now known as Her Serene Highness Princess Anni-Frid Synni Reuss, Countess of Plauen, Anni-Frid Lyngstad's time with ABBA preserved her status as a reigning queen of '70s pop for millions of adoring fans.