Board Thread:Official Announcements/@comment-24972932-20171011002240/@comment-30248084-20171011013715

Not sure if Sound Cloud is Royalty-Free, but listed below is some tracks that could be good?

Super Smash Bros. Brawl - Boss Theme

Serious Sam - Fight 2 (Ansia Orchestra Epic Cover)  - Ignore the extras after 2:18. Uneccesary content.

Serious Sam - Fight 3

Serious Sam III - Boss Fight

So what the majority is Serious Sam, they have the most excellent music with metal rock. :P