A pioneer of Darmstadt and the WDR electronic studios from 1954 on, then chairman of the Institute of Sonology after 1964, Koenig worked both with acoustic and electronic resources. This collection has two piano pieces, a string quartet, a long work for string trio, and electronic works dated 1967 and 1968. The acoustic music is serial and everything is extremely dry and austere and best listened to carefully and piecemeal, I think. For the acoustic music is more interesting, but in general I think it is an acquired taste, and is mainly now of historical value. Students, however, should be aware of this work.