I think they should have the following people do the soundtrack:
1. Hans Zimmer (Feat. Celldweller)
2. Danny Elfman (Main Theme of Movie only)
3. Michael Londra (Ending Song only, "Artemis")
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For the people who don't know who Celldweller is, listen to this and be amazed: http://www.youtube.com/watch?v=t4payPuRM-Q
Also, we need a track with ominous Faerie chanting.