There is that Laslor (?) lute he gives to Lohse and her demon breaks.
So there is such a thing in the game files. Maybe it can be copied and stats changed. So you basically change it into a "weapon" or "staff" type of item and make bard skills (spells) gray out without it equipped.
I think it would be only fair to have such a support build not be a fighter/scoundrel/ninja too, as it was always done so far in all other games. It would make it more unique.
Additionally it would be very nice if we could get new songs from quests and NPCs based on choices. Even make new songs based on companions history or adventures we go through. But thats of course outside of the scope and existing mechanics of the whole game.
