Originally Posted by The Pants Party
I would highly suggest doing the Unison dungeon on the first play. The second play all enemies get twice the health and 1.5x attack and defense, so you will need your characters all at level 99. It can be done at 75ish on the first play. Saves a ton of time.
Your character levels do not transfer to the second play.
Actually you can do Unison dungeon at level 65 with just Jazz, Allegretto, and Falsetto. That dungeon is really easy as long as you got a good grip on the harmony chains.