From Allmusic.com : "This experimental/avant-garde project featuring Christoph Heemann was an '80s underground group often affiliated with the post-industrial scene surrounding Nurse With Wound, Coil, Current 93, and others. Their albums were absurd tape collage experiments that combine Krautrock, musique concrète, and surrealist approaches to their arrangements. For this album, the pieces all blend into one psychedelic suite that almost suggests a progressive rock approach to warped experimentation. With the atmospheres in a constant state of flux, the juxtapositions make for an unsettling and disturbing music which will hold much appeal to fans of the greatest absurdist group of the '80s, Nurse With Wound."
"Willkür Nach Noten" was released by Dragnet Records in 1993.
Get it here : H.N.A.S. - Willkür Nach Noten