pierre schaeffer - "etude aux chemins de fer"
Why the open web links it
Pioneering 1948 piece of musique concrète using recorded train sounds as musical material.
Linked by 22 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including cornell.edu, pte.hu, andreafortuna.org, alexisrago.com, brambleleepryde.com.
Cited in 1 Wikipedia article, including History of music in Paris.