In 1955, Charles Trenet discovered Guylaine in Montreal and began writing songs for her.
She made a grand entrance at the Olympia with Charles Trenet and Louis Armstrong.
Settling permanently in Paris in 1956, she released on record several songs by Trenet and performed at the Bobino theater.
After touring Europe, North Africa, and the Middle East, she returned to Quebec.
She performed in Montreal at the opening of the Queen Elizabeth Hotel in April 1958, made several television appearances, and played the title role in Irma La Douce with the Theater of the New World.