What music is not derivative?

Gentle Giant?

Anything written by Morton Feldman between 1980 and his death. Long pieces of chamber music, often literally hours long, constructed from slowly floating patterns of quiet chords. Unlike anything else, and hypnotically beautiful. All of his late works have been recorded, gorgeously performed and engineered, mostly on the Swiss HatArt label.

radiohead's recent stuff (kid a, amnesiac) is pretty original. Also, Sigur Ros (Icelandic group, just kids really) is non-derivative. That's just as far as rock goes, which I think is what you're asking. But if you get into more experimental stuff... try Bernard Gunther or Kim Cascone - I guarantee you've never heard anything like their work.

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Roxy Music and The Talking Heads were a much needed breath of fresh air in the late 1970's and 80's.