Méchaly has been a regular member of a Baroque ensemble, Les Arts Florissants and has appeared in many operatic productions directed by William Christie.
[1] During her career Méchaly has performed in leading operatic roles on many occasions with William Christie, and his Baroque music ensemble, Les Arts Florissants.
[4] A reviewer wrote of her performance as Angélique in the eponymous work by Jacques Ibert "Gaëlle Méchaly’s light and flexible soprano is just right for the terrifying main role".
[7] In 2001, Méchaly appeared in the finals of the BBC Cardiff Singer of the World competition, where she performed works by Mozart, Bizet and Donizzetti.
[8] In 2023 and 2024, Mechaly has performed a Renaissance, Baroque and contemporary repertoire of "fantasies and love songs of yesterday and today" with the ensemble TM+, under the direction of Laurent Cuniot [fr], cellist David Simpson and viola da gamba player Silvia Lenzi.