Answer
Composition was among the subjects taught by Messiaen at the Schola Cantorum de Paris. Messiaen's teachings at the Schola Cantorum were influential in shaping the development of modern music. He taught harmony, counterpoint, and analysis, and his students included some of the most important composers of the 20th century, such as Pierre Boulez, Karlheinz Stockhausen, and Iannis Xenakis.