During his studies with Boulanger in Paris, Copland was excited to be so close to the new post-Impressionistic French music of Ravel, Roussel, and Satie, as well as Les six, a group that included Milhaud, Poulenc, and Honegger. Webern, Berg, and Bartók also impressed him. Copland was "insatiable" in seeking out the newest European music, whether in concerts, score reading or heated debate. These "moderns" were discarding the old laws of composition and experimenting with new forms, harmonies and rhythms, and including the use of jazz and quarter-tone music. Milhaud was Copland's inspiration for some of his earlier "jazzy" works. He was also exposed to Schoenberg and admired his earlier atonal pieces, thinking Schoenberg's "Pierrot Lunaire" above all others. Copland named Igor Stravinsky as his "hero" and his favorite 20th-century composer. Copland especially admired Stravinsky's "jagged and uncouth rhythmic effects", "bold use of dissonance", and "hard, dry, crackling sonority".