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The music needs to be about 2 minutes at most, and no less than 30 seconds. No action, or anything, just ambient sci-fi music.

for music try CCmixter, e.g.
http://dig.ccmixter.org/dig?dig-query=electronica [ check the license is compatible with your usage ]

e.g. http://ccmixter.org/files/gurdonark/29153 [ Attribution Noncommercial (3.0) ]

enter "sci fi" in the search, then sort by duration:

http://freesound.org/search/?q=sci+fi&s;=duration+desc&advanced;=0&f;=&page;=4#sound

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