Besides composing and writing, Collet taught at the Institut d'études hispaniques and later at the Collège Chaptal.
He received a number of awards including a silver medal from the Faculté de lettres of the university of Bordeaux (1908), the Prix Pierre Aubry (1913), and the composition prize of the city of Paris for his stage work La Chèvre d'or (1936).
His music is marked by his admiration for Spanish culture – a result of his studies and travels over many years on Spain.
In France, he contributed to the reputation of Spanish composers including Albéniz, Granados, Mompou, Nin and Turina.
Collet is best remembered for his two 1920 articles in Comoedia[2] in which he coined the term Les Six to designate a group of young composers at the Conservatoire de Paris.