*2022 Stock.* Unsichtbare Chöre features a tape piece made up of 16 layers of a cappella choir tracks, employing a variety of massed vocal approaches, including the use of percussive and whispered noises, joined by a couple brief, hypnotic multi-tracked clarinet sequences. This tape is used as a textural background layer in Act 1 of the opera Donnerstag aus Licht (the Stockhausen Edition No. 30). In Act 3 the same tape is reused, but with the channels reversed. Although some of this material can be subtly heard on Donnerstag aus Licht (The Stockhausen Edition No. 30), this release reveals the layered beauty of the isolated choir tape and clarinet parts. - Stockhausenspace.blogspot.com