Esther Gonthier holds an esteemed position in the Quebec world of vocal arts. She regularly works with the Opéra de Montréal, the Orchestre symphonique de Montréal, and the Orchestre Métropolitain as a rehearsal pianist, vocal coach, and assistant to the conductor. She also works with voice students at McGill University and the Université de Montréal, as well as with the young artists of the Atelier lyrique de l’Opéra de Montréal, with whom she joyfully shares her expertise.

Esther has been an official pianist for the Concours musical international de Montréal (CMIM) since its first edition dedicated to voice in 2002. She is also the rehearsal pianist for the semi-finalists and finalists of Voice 2025, for individual rehearsals with Guest Conductor Patrick Summers.