It's not on the NWW list, but it could be !
Karel Appel is a dutch artist, born in 1921, died in 2006, co-founder of the CoBrA group alongside Alechinski and Asger Jorn, avant-garde painter, sculptor, poet and at least experimental musician. You can get more informations on wikipedia (eng), fluctuat (fr) and here.
Appel was influenced by Dubuffet and his "art brut"/"outsider art" theory, and in this very rare record you can listening to the same experiments of dissonance and spontaneity we get in the Dubuffet recordings (go to ubuweb).
ripped by Rain. Karel Appel - Musique barbare (ZIP/RS)
[Update 15/09] Thanks to Continuo for giving the link of the video :
and thanks to KFW (aka Hrvatski) to upload this madness ! [/Update]