Warhammer 40,000: Armageddon Soundtrack:

Steam downloads game soundtracks to a separate folder in your game's Steamapps directory.
You can right-click on a game in your Steam Library, select Properties>Local Files and click Browse Local Files to access that game's directory.

The soundtrack itself consists of 12 tracks:

1. The Battle for Armageddon
2. Thakka's Plot
3. March of the Steel Legion
4. Dante's Retribution
5. Death Mire Falls
6. Yarrick's Choice
7. Crossing the Palidus Mountains
8. CUTSCENE Horst's Introduction
9. CUTSCENE Von Strab's Speech
10. CUTSCENE Faldrak's and the Space Marines
11. CUTSCENE Dante's Speech
12. CUTSCENE Yarrick's Finale