Theophrastus
Mruh. I've heard of five of those acts.
Does Sigur Ros count? Portishead?
I love Godspeed You! Black Emperor and enjoy Aphex Twin. Still don't know if either of those count. I guess not mainstream and not classifiable without at least five adjectives makes a good candidate.
Protishead is kinda experimental at times. Aphex Twin does some experimental ways to make music (doing a wave graphing of one's face and putting it in a song). A lot of black metal can be noisy too.
Semper Fiasco
Hm.
The Sound of Animals Fighting. Music in a test tube.
Great for when you want to listen to something other than what we often call "music."
Kayo Dot's pretty good, too. The Surgeon General has determined that life without Kayo Dot is not classifiable as "life."
Dissonance is always enjoyed.. or no sound at all like Johnny Cage!
Never heard any Kayo Dot's stuff.. It's hard to get new names due to geography. xD
I also enjoy midi - grind.. preferably anime - influenced stuff.