In 1965, she represented the Netherlands in the Eurovision Song Contest held in Naples, Italy, with the song "'t Is genoeg", finishing in eleventh place. One year later, Vandenbos finally achieved chart success with her first hit single, "Ik ben gelukkig zonder jou". In the early 1970s, Conny parted company from Philips and signed with Basart Records in January 1973. During her contract at Basart, several albums were released and her singles charted frequently on the Dutch pop charts.