He became in turn a teacher at the Schola Cantorum and had Louis Durey as student, with whom he worked solfège, harmony, counterpoint and fugue.
He was an organist and choir conductor of the Société des Chanteurs de Saint-Gervais[1] founded by Charles Bordes.
Léon de Saint-Réquier held these two positions at Saint-Gervais from 1925 to 1939, when he was replaced by Paul Le Flem.
Léon de Saint-Réquier composed many works for organ and harmonium, as well as other sacred music pieces, for choir, including masses and a Requiem.
The cartoonist Christian Binet [fr], also an accordionist, said about him: "It sounds like a joke but this aristocrat whose name is also that of a village in Normandy was also a composer.