the problem with the genre name "noise" is that it is the word "noise" is also an adjective that can be used to describe dischordant or unpleasant music from other completely disimmilar styles, which causes a large amount of confusion amongst people unfamiliar with noise the genre. the velvet underground, my bloody valentine and even lightning bolt are not noise, they are merely noisey, but in no way does this mean the sound like noise music, just that their music is loud and unruly.
listen to some samples of Noise music by clicking these links:
http://www.importantrecords.com/sounds/minazo1_2.mp3 http://www.importantrecords.com/sounds/minazo1_3.mp3
it's like when people talk about drum n bass and people think you're talking about music made using a drum kit and a bass guitar.