After leaving Esa Pethman's quartet Carola became the vocalist for the Swiss Hazy Osterwald Sextet. During 1964 she toured the Central European scene and performed on television programs. Returning to Finland in 1965, Carola released a single in German, "Warum Willst Du Das Alles Vergessen" and also performed with a backup band, The Boys, who mostly recorded cover versions of songs in the English language, including the Rolling Stones' "The Last Time" and Skeeter Davis' "The End of the World". Carola starred both as a singer and actress in the musical television film "The Cold Old Days", with the film winning the Golden Rose of the Montreaux Film Festival. Her performances in the film included a cover of Manos Hadjidakis's song "All Alone Am I", for which she herself composed the French lyrics.