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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The first song that popped into my head was "bulls on parade" by rage against the machine. It just seemed right. They did describe it as metal