343 Industries put up the entirety of the original game soundtrack for Halo 5: Guardians online for free. You can listen to the entire thing right now if you wanted to, and you probably should because it's phenomenal.

The entire 39 piece OST is there. It's good. It's really good. Below are a couple of songs. You can listen to the whole thing over at SoundCloud.

Blue Team
[SOUNDCLOUD]https://soundcloud.com/343ndustries/2-10-blue-team[/SOUNDCLOUD]

Halo Canticles
[SOUNDCLOUD]https://soundcloud.com/343ndustries/1-01-halo-canticles-1[/SOUNDCLOUD]