The choirs, singing classes, and string ensembles of the CMG, led by Cécile Polin Rogg, Magali Perol-Dumora, and Simon Bouveret, will present “Il y a longtemps que je t’aime.” Afterwards, the CMGo Orchestra and former CMG students, under the baton of Domingo Garcia Hindoyan, will perform Gustav Mahler’s “Symphony No. 1 in D major,” known as “Titan.”