To support himself he sang in cabarets to his own guitar accompaniment, also playing for Piaf and Montand, and also composing his own songs.
He began a long association with the Opéra-Comique in 1952, as Gérald in Lakmé,[2] quickly establishing himself as one of the leading tenors of his time, other roles included; Nadir, Meister (singing in the 2,000th performance at the Salle Favart), des Grieux, Julien, etc.
He made his debut at the Palais Garnier, as Damon in Les Indes galantes, other roles there included: Faust, Werther, Almaviva, Duke of Mantua, Alfredo, etc.
In his obituary, Alan Blyth described Legay's voice as "light yet penetrating timbre, its flexible, liquid character" and that he used it "with fastidious taste" and displayed "keenness of word-painting allied to the inflections of the music".
[1] Along with such mid-twentieth century tenors as Alain Vanzo and Léopold Simoneau, Legay represented a lost style of French operatic singing.