I am quite sure that normal combat music for enemies in the Spiral's available worlds are fine, but I feel that there's no battle combat music for bosses in these worlds. I mean, Aquila's bosses that have their combat theme, very epic, albeit applied on some instead of all, so I think I would kindly ask of you to add in boss combat music to the bosses in the available worlds of the Spiral & upcoming, too.
If some of you have concerns on how it would work out, W101 team, even you, Professors Falmea & Greyrose, here's my words of advice on this. Try going through one world at a time, like going slow, starting with Wizard City and through the rest up to Khrysalis & apply some of the boss combat music themes in some of the worlds in a small game update instead of all of it in one large update. Hope there would be boss combat music for later worlds after Khrysalis.
In any case, hope you can consider this, please. Thanks!