He was subsequently engaged as a violinist at the Opéra de Paris and later joined the Société des Concerts du Conservatoire.

[citation needed] Having journeyed to England and assisted at a Handel festival, he thought he would attempt something similar in Paris.

He also gave performances of Bach's St Matthew Passion, Handel's Judas Maccabaeus, Gounod's Gallia, and Massenet's Eve.

[citation needed] Lamoureux then drew up a contract with the Théâtre du Château d’Eau to give weekly symphony concerts.

After conducting one of the performances of this masterpiece he was taken ill and succumbed in a few days, having had the consolation before his death of witnessing the triumph of the cause he had so courageously championed.