I'm not even far through the game yet, but man I am totally loving the music in this game. I know the music has always been great in previous instalments, but the diversity in this one is pretty damn cool. In the first mission there's a cool cutscene and the music hits. I would post a video, but no. It's damn cool though. I hope you guys enjoy that part as much as I did!

I've heard the music for the opening of Tip of the Spear, and man, that sounds amazing! I love the little riff on the Halo theme about halfway through it. 
 
Glad to hear it's awesome!

I wouldn't expect anything less from Marty O'Donnell.

Marty O'Donnell always composes some of the best tracks I've heard out of any medium. 

It still can not be better than the music in Halo 1.That kicked major ass.

I like O'Donnell quite a bit, but I think Murray Gold of the recent Doctor Who revival is better :)

Sounds pretty good. I generally like Halo music a lot, and I like Marty O'Donnell, but he's kinda becoming like the John Williams of video game music, not a whole lot of variation. 

 
Also they have ALL the copies of reach at my local blockbuster just sitting there riiiiight outta reach. I'm jealous.  
 
 
Edit: Oh god, oh god, awful AWFUL pun NOT intended.

O'Donnell is just amazing at what he does, so I'm not surprised. Can't wait to play the game and hear the tunes in the campaign for myself.

i recommend listening to the ODST soundtrack on Youtube, 19 amazing songs.  Marty's awesome.

I found this link, where you can preview all tracks. They are really great!
 
(Minor spoilers, for names of things like missions)

" Marty O'Donnell always composes some of the best tracks I've heard out of any medium. 

 I wouldn't be surprised if he was inspired by Maurice Jarre. "