There are not many Games out there with epic in-game Music. Fortunately, the default music can be muted so you can play your preferred songs in the background.
This applies also to Serious Sam 3 and Diablo 3 in my opinion. So I took a few minutes to compile my own “Soundtrack Compilations” for those two games on Spotify. You can access an subscribe to these playlist simply using below links:
This should definitely add some more epic background music when slaying or shooting through the games 
Enjoy!
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serious sam doesn’t need an epic soundtrack because it does not have an epic story (except for the ending)
on the other hand, here are two examples for games with epic soundtracks, so good indeed, that I tend to listen to just the score and not play the game!
http://www.youtube.com/watch?v=Sjvo0SPAOiQ
http://www.youtube.com/watch?v=DSOkM4e85SA
@Dikk: Serious Sam has too little Metal music which one needs when slaying hordes and hordes of aliens
If you checked out the playlist I posted, you will see it’s far from a “Soundtrack” replacement, but more for play experience boosting 