imo bard should get a "Soul Voice"-kind of limit break, e.g

lvl 1 : Small regen on group, Fairly decent dot on target.
lvl 2 : Large Regen, atk/def boosts , defense down on boss etc
lvl 3 : xxx% attack/cast speed, Strong Regen, ATK/DEF up, target gains strong DOT, and some defenses lowered for the period.

this would make 10000000000000000% more sense than just giving them the healer LBs -.-