Nippon Cultural Broadcasting (= Bunka Hōsō) is known for airing Toshiro Mayuzumi’s composition for “Works for musique concrète X.Y.Z.” the very first Japanese work of musique concrète. Now, for the first time, the long-lost broadcast recordings produced by the director of that era are being released! These include a piece by Yori-aki Matsudaira's father, Yoritsune Matsudaira, created by repeatedly dubbing instrumental material, as well as an experimental work unique to Bunka Hōsō, produced through tape manipulation of existing records. Unlike Mayuzumi’s more “straightforward” collage-style pieces, these lack immediate impact, instead deploying highly sophisticated modernist musical idioms, so much so that only true “advanced contemporary music connoisseurs” will be able to keep up!