Charles-Marie Widor
Ermend-Bonnal received initial musical instruction from his father, a violinist. He then studied piano at the Conservatoire de Paris under Charles-Wilfrid de Bériot, harmony under Antoine Taudou, composition under Gabriel Fauré and organ under Alexandre Guilmant and Louis Vierne. He also assisted Charles-Marie Widor at Saint-Sulpice, Albert Périlhou at Saint-Séverin and Charles Tournemire at the Basilica of St. Clotilde.