R. Murray Schafer

Composer. His publications on children's music education, begun in the 1960s, "were widely translated and particularly influential in Central and South America."

https://www.theglobeandmail.com/canada/article-canadian-composer-r-murray-schafer-followed-his-own-iconoclastic-path/

https://www.cbc.ca/music/r-murray-schafer-composer-writer-and-acoustic-ecologist-has-died-at-88-1.5404868