Yes, you might find that even as a warrior, some spells can come in handy. Restoration for instance, but you get that like 4 times in the game by finishing certain quests, so you don't really have to invest anything in that.
Anyway, about the drummers though, if you're a high enough level, and strong enough, you should be able to hurt them more/faster than they can heal. So just leave them alone for now, and come back later is what I'd suggest.
Tovi 
