The duo was formed in 1983. Both Krogh and Andreassen were frequent Eurovision contestants. Krogh has appeared three times, all for Norway - in 1971 as a soloist, with Bobbysocks! in 1985 and as part of Just 4 Fun in 1991. Andreassen sang for Sweden as one half of Chips in 1982 and after winning with Bobbysocks, teamed up with Jan Werner Danielsen in 1994 and sang solo in 1996.
According to John Kennedy O'Connor's The Eurovision Song Contest: The Official History, Andreassen is one of only four lead artists to sing in the contest on four occasions and is also one of only four artists to finish both first and second in Eurovision (1985 & 1996). The duo's debut single was "I Don't Wanna Break My Heart" in 1984, released in a pink colored vinyl.
The concept behind Bobbysocks! was to bring up to date songs from the 1950s with a swing mood, adding them a "modern" 1980s sound. That idea was fully applied on their first LP Bobbysocks!, which was a mixture of covers and brand new songs, but partially abandoned on the 2 subsequent albums, which had more pop sound instead of swing.