 Martin's voice was described as a "ténor grave et sombre", meaning a deep-voiced dark tenor, or as a "baryton aigu et clair", meaning a clear-voiced high baritone; the compass was E flat to a", with a falsetto extension to a"'.His vocal type became known as "baryton-martin", most often found in French operetta.Modern example of this voice type were French baritone Michel Dens, or closer to us Bernard Sinclair, who can be heard in a few operetta recordings such as "La fille de Madame Angot", "Les cloches de Corneville", and "Valses de Vienne".