It's not co-op, but the game it's based on is. Amazon is now listing the Halo Trilogy soundtrack as shipping December 2nd. The box set will contain all 5 discs from Halo, Halo 2 and Halo 3. It'll set you back just shy of $30, but it's a small price to pay for one of the best original scores in video game music.
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I had the first 2 on my Halo 3 Zune and I reinstalled Windows and then the Zune software wiped it from the Zune.