Svenne Hedlund was lead vocalist of the successful Swedish group Hep Stars around 1960.
Charlotte Walker (b.1944), was a former member of the American group The Sherrys, later moving to Sweden and becoming a member of the Hep Stars, adding female vocals, in 1968. She married Hedlund, and shortened her name.
The couple formed the duo after the Hep Stars parted ways and recorded several albums for the Polar label. In 1975, they took part in the Swedish selection (Melodifestivalen) for Eurovision Song Contest with the Swedish, "Bang En Boomerang", written by former Hep Stars bandmate, Benny Andersson and Björn Ulvaeus, of ABBA (who, as well as Svenne & Lotta, recorded an English version). Svenne & Lotta came third in the selection.