In 1955 she met her future husband, guitarist Jørgen Ingmann. The couple married in 1956 and performed as the duet Grethe og Jørgen Ingmann. Together they won the Eurovision Song Contest 1963 representing Denmark with the jazz waltz "Dansevise" (Dancing tune) with music by Otto Francker and lyrics by Sejr Volmer-Sørensen. It was the first entry performed by a duo to win the Contest and also the first Scandinavian winner.