 In 1920, Vincent d'Indy published a study of Dukas's music; Debussy remained a lifelong friend, though feeling that Dukas's music was not French enough; Saint-Saëns worked with Dukas to complete an unfinished opera by Guiraud, and they were both engaged in the rediscovery and editing of the works of Jean-Philippe Rameau; Fauré dedicated his Second Piano Quintet to Dukas in 1921.In 1920, he became a member of the Royal Academy of Science, Letters and Fine Arts of Belgium.Dukas died in Paris in 1935, aged 69.