Title.
One of my favorites is this one from Payday 2 ( Payday 2 was such as an great game, but developers sadly killed it with their '' Balancing '' ;-; ) It feels quite epic, and the way it was designed for a specific mission of the game makes it extremely good : The mission the soundtrack is for, like the name says, its more or less an pursuit, an guy your contract is to eliminate him is running to the top of the building and you have to reach him. It matches with the part you are on it unless if you stand on a spot not progressing for long, then at the second half of it it just begins to get epic when the fight on the top floor begins. Specially due to the other 2 parts that are similar to 1:00. It just feels amazing for me. Here it is :
https://www.youtube.com/watch?v=kE2oqZUfrXo
Edit : And this track, of the same game, it might be also worth mentioning : https://www.youtube.com/watch?v=xIf7sIQ73ok
What about you? What is your favorite soundtrack outside of SK?
Minecraft.
'Nuff said.
Unless it's a specific track from a game in which case On the Beach at Night from Starbound.