As you can tell by the image, my favourite is ODST (much soothing, very rain) but I love the others just as much
You're not allowed to answer Halo 5 for obvious reasons.
If you don't like or haven't played halo and you're just here to hate them I suggest you don't comment
EDIT: [b]How the -blam!- did I remember Spartan strike and FORGET Halo Reach, my second favourite halo game?! Wtf is wrong with me? Comment if Reach is your favourite[/b]
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Halo ODST had the best soundtrack and atmosphere due to Marty! Wtf? Bungievision. I just loved the music score on ODST most of all but tbh I have liked the music scores from all the Halo games from CE up to Halo 4. I include Halo Wars and even Spartan Assault/Strike. What has been leaked already of Halo 5's if true is very promising, but you are right we have to play the game first and hear the full soundtrack.