His other unpublished works include several motets, the cantata À la gloire de Jeanne Mance (1942), and incidental music for Antigone and the biblical dramas Jonathas and Tobie.
While there he studied the cello with Gustave Labelle, singing with Alfred Lamoureux, piano and organ with Arthur Letondal, and music theory with both Achille Fortier and Romain Pelletier.
In 1943 he joined the music faculty of the newly established Conservatoire de musique du Québec à Montréal (CMQM) at the invitation of Wilfrid Pelletier.
He taught at the CMQM through 1971, where his notable students included Gaston Arel, Raymond Daveluy, Kenneth Gilbert, Bernard Lagacé, Aline Letendre, Lucienne L'Heureux-Arel, and Michel Perrault.
[1] Cusson also published works on the teaching of music, including Quelques souvenirs des années and 30 et sur un sujet bien actuel (Vie musicale, December 1970).