where can I find free exp music? would like to feature some of them on my site!

You might want to try http://www.epitonic.com -- they have a lot of full-lenth tracks from quite a few avant-garde and experimental music styles. Browse through their genre sections and you'll find the experimental, modern composition, math rock, and jazz sections full of samples from great avant-garde musicians.

Hope that helps.

I know The Wire has mp3s of artists they are featuring. They might be more of the mainstream of experimental, but you might find some interesting things there. www.thewire.co.uk