In the Flood it is said that the ODST play their anthem. Nothing is touched upon regarding it since, but that got me thinking.
[url=http://www.youtube.com/watch?v=m9ocAUQnNdE&feature=related]What if this is the actual anthem[/url]
The very song used in the live action trailer.
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I think this song is well done. Although, I am sure they have a better song. Don't doubt me, this sound could be it as well...