*AVANT GARDE. holy shit can you get it more wrong.
weeeeell. The Velvet Underground (first two albums), Les Rallizes D?nudes ('77 Live), James Chance & the Contortions (Buy), Boredoms (Vision Creation Newsun, Super Roots 7), Roxy Music (For Your Pleasure), Sonic Youth (start from Daydream Nation and go backwards. I skipped Bad Moon Rising though), The Fall (hmmm... listen to This Nation's Saving Grace, then The Wonderful and Frightening World of the Fall, then Hex Enduction Hour)
That's all I can think of now. For more heavy (well, difficult): Sun Ra (Atlantis), Ikue Mori (Hex Kitchen), Royal Trux (Twin Infinitives).