Harmonize
Level 6 Manipulate Concentrate Bard Metamagic

Prerequisites: Maestro Muse

You can perform multiple compositions simultaneously. IF your next action is to cast a composition, it becomes a harmonized composition. Unlike a normal composition, a harmonized composition doesn't end if you cast another composition, and you can cast another composition on the same turn as a Harmonized one. Casting another harmonized composition you have in effect.