Claim: In La cour de Célimène , which is an opéra comique, (a genre of French opera that contains spoken dialogue and arias), the two roles: the La Comtesse (a widow), and La Baronne, (her sister, also widowed), both had soprano voices, while the Le Commandeur de Beaupré had a bass voice.
Evidence: La cour de Célimène (The Court of Célimène), also known as Les douze (The dozen) is an opéra comique in two acts by French composer Ambroise Thomas. Opéra comique (French: [ɔpeʁa kɔmik; plural: opéras comiques) is a genre of French opera that contains spoken dialogue and arias. La Comtesse, a widow La Baronne, her sister, also widowed soprano soprano Le Commandeur de Beaupré bass