Sven-Ingvars is a Swedish pop/rock group from Slottsbron, Sweden. The group began as a dance orchestra in 1956, and the original members were Sven-Erik Magnusson (clarinet), Ingvar Karlsson (accordion) and Sven Svärd (drums). In 1958, bassist Rune Bergman joined the group and they began to play rock 'n' roll music. Sven-Erik Magnusson made the transition from clarinet to guitar and became the group's vocalist. Their breakthrough came in 1961 with the song "Te' Dans Me' Karlstatösera".