Very surprised this hasn't got a thread of its own already, it's really an amazing addition to the game, even if you don't like making music, or have no idea where to start.
For anyone who hasn't looked into this yet, a video covering the bells and the event (ensemble):
And for anyone who hasn't seen the choir bells yet, here's what they can do:
Can you guess the music/songs? :3 Some are played badly, but the timing gets hard when the delays are unpredictable ;(.
This addition is so awesome XD yes it's a mini game, yes it may just be a time waster, but the potential here is epic. If you were organized enough, you could get a bell choir going of your own, conducting all sorts of crazy nonsense. If you're a dab-hand at editing, you could effectively do it yourself.
There's a reddit list of songs which people are contributing to, it's already pretty big:
So! How have you folks found the Ensemble event and have you messed around with any of your own music yet? :3 Personally can't wait to get my hands on an unbreakable bell!