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!

Original broadcasting of Matsudaira’s work consisted of movements with commentary. The commentaries
 were deleted in regular CD because they were long (approx. 1 minute each) and hard to understand the high detailed process of composition. This special edition #1 is added a booklet rewritten of a dojinshi (coterie magazine). It was addressed to Yoriaki Matsudaira arrived from Nagayoshi Kajiwara (born 1925), who had been a director at Bunka Hoso, Texts are in Japanese and English, A5, 10 pages.