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Comprised of vocalists Jenny Berggren and Linn Berggren, and keyboardists Jonas "Joker" Berggren and Ulf "Buddah" Ekberg, the Swedish quartet Ace of Base became a phenomenally popular international act with their 1993 debut album, The Sign. Ace of Base's simple, melodic Euro-disco was equally popular on radio and in the clubs, earning the quartet three U.S. Top Ten singles -- "All That She Wants," "Don't Turn Around," and "The Sign," which spent six weeks at number one. Before the quartet formed in 1990, sisters Jenny and Linn Berggren sang in local church choirs in Gothenburg, Sweden. Their brother, Jonas, played synthesizers and wrote songs with Ulf Ekberg. Eventually, Jonas and Ulf recruited Jenny and Linn to sing with them, and the quartet began playing dance music at local clubs in the late summer of 1990. Within a year, the group signed with Mega Records and released their debut single, "Wheel of Fortune," in 1992. By that time, the quartet had joined forces with John Ballard, w...