 It quickly attracted many who either were or were later to become notable composers, including Olivier Messiaen, Pierre Boulez, Jean Barraqué, Karlheinz Stockhausen, Edgard Varèse, Iannis Xenakis, Michel Philippot, and Arthur Honegger.Compositional "output from 1951 to 1953 comprised "Étude I" (1951) and "Étude II" (1951) by Boulez, "Timbres-durées" (1952) by Messiaen, "Étude aux mille collants" (1952) by Stockhausen, "Le microphone bien tempéré" (1952) and "La voile d'Orphée" (1953) by Henry, "Étude I" (1953) by Philippot, "Étude" (1953) by Barraqué, the mixed pieces "Toute la lyre" (1951) and "Orphée 53" (1953) by Schaeffer/Henry, and the film music "Masquerage" (1952) by Schaeffer and "Astrologie" (1953) by Henry.In 1954 Varèse and Honegger visited to work on the tape parts of "Déserts" and "La rivière endormie"" .