No surprise -- the people making negative comments here are the same people who said $(your favourite rebellious composer) wasn't music. People who say that are always judged as wrong, in the end.
If you understand stuff like this you can appreciate the music. I'm not exactly going to sit down and listen to it in a dark room sipping some red wine, but it's a new and unique compositional technique that can be incorporated into other music.
I understand it. I have no appreciation for it. sorry.
By whom?
Some early music used 5-note scales and regarded 2nds and 7ths as unusable (I'm referring to music in the west; folk music elsewhere often still uses 5-note scales). Early music was monophonic, but that limitation was overcome by the 12th century I think. Bach was genteel, but Beethoven was emotional. Brahms was tonal, but Debussy allowed atonality in music. Cage allowed aleatoric sounds to be music. Glass allowed excessive repetition of simple patterns to be music.