In 1969, he joined with his Shadol bandmate Normand Bouchard with two singles "Nous avons marché" and "J'irai un jour à Paris".

The SODRAC (Société du Droit de Reproduction des Auteurs, Compositeurs et Éditeurs au Canada) considered it as a great song of Quebec.

As a follow-up on the fame of "Comme j'ai toujours envie d'aimer", Hamilton also released the single "Tapis magique".

In the early 1970s, he released three albums, the self-titled Marc Hamilton in 1970, Comme j'ai toujours envie d'aimer also in 1970 containing his famous song as the title track and Au fond des choses in 1972.

In 1973, as a result of an accident, he lost his left eye, but persevered in musical projects notably programming for the activities of Grand salon de Mascouche.

The press reported that the singer had alcoholism and dependency on prescription medication and extreme bouts of anxiety and suicidal tendencies.