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!