Effective period / Period of releases: 1964 - 2004

Members: Benny Andersson, Totte Päivärinta, Lotta Hedlund, Svenne Hedlund, Janne Frisk, Christer Pettersson (2), Hans Östlund (2), Lennart Hegland, Kookie Tian, Torgny Stoor, Josephine Tian, Bengt "Bengan" Arenblad, Peter Molin (3)

Swedish pop group formed in 1963 under the name Quartet Yep. The group was one of the most successful in Sweden in the 1960s. It was dissolved in 1973, but re-emerged in the late 1980s. Several of the members have achieved success on their own or in other groups, including Svenne Hedlund as solo artist and Benny Andersson in Abba, among others.

Members of hit-making line up:
Janne Frisk
Svenne Hedlund
Lennart Hegland
Christer Pettersson
Benny Andersson

Benny Andersson replaced founding member Hans "Hasse Hep" Östlund on organ after their first 45 release. Later joined by Charlotte "Lotta" Jean Hedlund, née Walker, wife of Svenne Hedlund (later they formed the duo Svenne & Lotta).