Improvised sound like this in my opinion is closest to the experience of painting. Do these musicians consider their art as painting with sound?
Note revisit Russolo’s manifesto The Art of Noises

http://www.artype.de/Sammlung/pdf/russolo_noise.pdf retrieved 22.9.13
http://www.youtube.com/watch?v=swnYWNGznaU retrieved youtube 2.9.2013