 His singing is often counterbalanced by a chorus formed by well-known Quebec singers of the time, including Beau Dommage's Pierre Bertrand, Les Séguin's Richard, and Ville Émard Blues Band's Estelle Ste-Croix.The signature of Harmonium, that is, the rich sound of the 12-string guitar, still remains the backbone of a few songs, particularly in "Comme un fou" and at the end of "Le corridor".But "L'Heptade" offers a more sophisticated music than in the past.