The very last time he sang on stage was in 1994 when he was 92 . He sang M. Triquet in Tchaikovsky 's Eugene Onegin when it was given by the Lausanne Opera at the ThÃ Ã cents tre du Jorat in MÃ ziÃ res . His very last appearance on stage was in 1994 , aged 92 , when he sang M. Triquet in Tchaikovsky 's Eugene Onegin at the ThÃ Ã cents tre du Jorat in MÃ ziÃ res .