Velleda won the second Prix de Rome, he became music critic for the Revue Hebdomadaire, and his works include a Symphony in C, Variations, Interlude and Fugue on a Theme of Rameau, and La Peri (pay-ree), a ballet.  
Along with Saint-Saens, he completed Guiraud's unfinished opera Fredegonde.  After his cantata Velleda won the second Prix de Rome, he became music critic for the Revue Hebdomadaire, and his works include a Symphony in C, Variations, Interlude and Fugue on a Theme of Rameau, and La Peri (pay-ree), a ballet.  FTP, identify this composer, who is best known for an opera, Ariane and Bluebeard, and an orchestral scherzo made famous in Fantasia, The Sorcerer's Apprentice.
Along with Saint-Saens, he completed Guiraud's unfinished opera Fredegonde.  
Paul Dukas