In 1919 Inghelbrecht conducted the first performance of André Caplet's arrangement of Debussy's La boîte à joujoux; he also founded the Concerts Pleyel devoted to music of the 16th to 18th centuries.
[4] Inghelbrecht was music director of the Opéra-Comique in 1924–25, where he conducted Massenet's Manon, a new production of Wagner's Tristan und Isolde, Debussy's Pelléas et Mélisande, and Fauré's Masques et bergamasques and Pénélope; he also conducted several ballets including the premiere of his own Jeux de Couleurs.
The following year, he fulfilled a long-held ambition to conduct the first Paris performance of the 1874 edition of Musorgsky's Boris Godunov.
But when planning the 1,000th performance of the orchestra (which was also to commemorate the 25th anniversary of Debussy's death), Inghelbrecht refused to conduct a program devoted to music of the occupying German forces and on 18 July 1943 received a note suspending his appointment by order of President Laval.
He was married three times: to Colette Steinlen (1910, divorced in 1920), Carina Ari (1928) and Germaine Perrin, with whom he wrote a biography of Debussy in 1953.