During the war, the Ligue Nationale pour la Defense de la Musique Française was formed by Saint-Saëns, Dubois, d'Indy and others, campaigning for a ban on the performance of contemporary German music. Ravel declined to join, telling the committee of the league in 1916, "It would be dangerous for French composers to ignore systematically the productions of their foreign colleagues, and thus form themselves into a sort of national coterie: our musical art, which is so rich at the present time, would soon degenerate, becoming isolated in banal formulas." The league responded by banning Ravel's music from its concerts.