In the 1950s, Borg was a Swedish pop-queen. She made many recordings, first for "Sonora", then for "Knäppupp". In 1959, it was decided that whichever song won in the Melodifestivalen she would travel to sing in the final of the Eurovision Song Contest 1959 in Cannes. In the final she reached a respectable 9th place. It was "Augustin". In 1960, she performed as Hasse Alfredson's duet-partner in the comic "Oj då kära nån" and "Märta Melin och Ture Tyrén" and was awarded the honour of singing a duet with Evert Taube in two recordings of "Invitation till Guatemala" and "Mary Strand". In 1961, an LP recording was made where she interpreted "Århundradets melodier" ("The tunes of the century"), including "Hässelbysteppen", "Min soldat" and "Sjösala vals". Her genre was traditional pop songs, with the, at the time, common leaning towards Italian ("La strada dell'amore", "Ciao ciao Bambina"). She had attempted a more modern style with "Frankenstein rock" in 1957 but was eventually surpassed by younger, but less voice-strong singers, with greater appeal to a young audience. Stig Anderson, Björn Ulvaeus, and Benny Andersson gave her a final hit with the song "Ljuva sextiotal", which stayed in the Swedish charts (Svensktoppen) for 20 weeks in 1969.