The ODST soundtrack is simply tremendous, if you haven’t taken the time to listen to it, you should.
My favorite soundtrack among all the Halo games. I love it!
My favorite is Neon Night from O.D.S.T
I love listening to that opening theme
i like the ODST soundtrack too 
my favorite track on it is The Menagerie (the part that plays at the end of the level NMPD HQ)