Came here expecting a thread about brd having high rolls. Most good bards already understand their role pretty well, though I wouldn't throw out ballad just to help healers dps; most fights that matter their attention needs to stay on healing, regardless of mp management.
And the TP management issue has already been responded to. There's certainly exceptions, but they're called exceptions for a reason.
And songs drain your MP, so using any of them when they're not needed can put you in a place where you don't have the MP to use them when they are.
