Ace of Base Is a Swedish pop group who scored a string of international hits in the early-to-mid 1990s. They’re best known for their upbeat reggae-tinged dance-pop songs, including “The Sign”, which was the biggest hit of 1994, according to The Billboard US chart. The group’s core lineup consisted of producers Ulf “Buddha” Ekberg and Jonas “Joker” Berggren, along with singers Malin “Linn” Berggren and Jenny Berggren (the three Berggrens are siblings).