Or the melee can simply tell the bard, hey we'll be going AOE heavy on the trash, sing Paeon will ya, simple. In Turn 4, where I currently go as a monk, I just tell our Bard, sing Paeon for the AOE phase, usually around half way through, coz that's when my TP will be low. If the Bard is aoe-ing as well he will know that otherwise I have no problem letting him know. I don't need the Bard to tell me when they will sing Paeon, if I know there are going to be some heavy AOE phase then I'll tell them they should sing Paeon.