Here is a topic where ppl share their favorite halo music throughout the years. for many months i have been trying to find what is the music in the original halo wars trailer specifically at 38 seconds. i need help
X-06 from HW Bonus DVD Exclusive Soundtrack. Check at around 0:36: https://www.youtube.com/watch?v=zcvUhQj1lnU&list=PL14F37C2362FE4084&index=9
This is te best but you have to be driving a warthog to the end of halo to appreciate it 
The Halo theme played during the Warthog ride at the end of Halo 3 is my favorite song in the series. That said, my favorite soundtrack is…believe it or not…Halo 4. It wasn’t classic Halo, but I loved the soundtrack. I’d sometimes listen to it on my work commute.
The whole Halo 3: ODST track is amazing. Who would’ve thought that rain paired with smooth jazz would work so well!
My all time favorite would be One Final Effort, but the extended and I believe remastered for the ultimate warthog run in Halo 3 last mission
my second would be Never Forget, Unforgotten, from H2 and H3.
my third would be Epiloge from halo reach, truly seeks its way ro my heart
fourth ashes halo reach
5th litreraly every h3 odst music
The music in the first 3 Halos were my favorite, Reach is good too but I like the originals not that I don’t like the new stuff I’m just so and still hooked on the old themes and music.
One Final Effort is my absolute favorite song in Halo, followed by Behold a Pale Horse. My wife isn’t much of a gamer, but she loves the orchestral music of Halo.
Light is Green is one one my favs, along with Tip of the Spear.
- Cratered -Halo Wars 2 - Warthog Run -Halo CE and 3 - 117 -Halo 4 - Epilogue -Halo reach - Covenant Dance -Halo CE
Orbit of Glass from Halo 2 not only has one of the best track names in the series, not only is a phenomenal track, but comes during a particular moment in Halo 2’s campaign (that looks even more beautiful in Anniversary; play the mission, the walkthroughs almost never look at the skybox which is the highlight of the ride) that I consider to be the pinnacle of Halo. It’s a brief, somber moment in the chaos and race for the activation index, and I think that Sacred Icon (which is my favorite Halo level) is the peak of Halo art design, between High Charity, the ring, the Forerunner structures, and the Quarantine Zone.
Basically any Flood related track throughout the Franchise.
Unyielding is definitely my all time favorite, though.
Pretty much the whole Halo 2, Halo 3 and Halo ODST OST for me.