Fights can be ridiculously unbalanced in this game. I'm a Burning Hill mage and have loads of powerful attacks, but if you fight someone with silence or paralyse then they just wipe out every move you do. The only way I can win is to have more mana and wait for them to run out. Doesn't make for a fun game.
Did you clear the playlist before adding party? If not, then the previous Grindcore music you were listening to will still be there.