about the Ursonate:
the bottom of this montage you can see the ursonta in its visual form. On
the left: Kurt Schwitters in performance. Listen to it: Click
on the arrow button. I have found more recordings of the Ursonata: one by
Alexander Voigt and one by Jaap Blonk (What a nice name!) He looks great as
well. See the pic below. Also check out Spiritus Noister's interesting interpretation.
You can listen to it on this webiste: http://www.asa.de/topical/ursonate/