Castel made her debut in the music industry by collaborating with Les Baronets' Jean Beaulne on the album Toi et moi amoureux.
The title track and the song "Sous Notre Toit" became well-known successes in Quebec. For the following years, Christine Charbonneau's compositions, such as "Du fil des aiguilles et du coton," "Château de sable," "Sur le pont," "Je le vois dans la soupe," "Dominique," "Au fond de nous," and "L'amitié," were the majority of the songs Castel recorded and performed.
She started creating her songs later in the 1970s, influenced by blues music.
Du fil, des aiguilles et du coton (1973), To One and All (1973), Je le vois dans ma soupe (1973), Moi j'veux pas déranger personne (1974), Quand on aime on a toujours 20 ans (1975), En corps à coeur (1976), and Nol disco (1976) are the seven solo albums she released during the 1970s (1977).
In subsequent seasons, she appeared on the television shows Omertà and Sous un Ciel.
She appeared in a 1980 performance of Starmania as Stella Spotlight in musical theater. In a 1986 performance of Le Phenonène M by Normand Mongeon and Roch Harvey, she portrayed Marlene Dietrich.
Betty Bird in Michel Tremblay's Demain matin, Montréal m'attend was one of her latter musical theater roles. I by Marc Drouin and François Dompierre features and Janine.