I recorded an arena battle after swapping in my own choice in battle music for the default theme. I like the original theme, but its gotten a bit repetitive so I changed it for some variety.
Yeah, I'm not playing that well in this video; I delayed the battle a bit to let the theme play out. That, and it's Tier 3, so I'm being very picky about my moments.
That music is really , really, really epic, I have no idea if it's from something else or you made it but, it really gives a feel that you're fighting for your life to get out of the Arena alive, that you can't give up and must push through.