So, how exactly will the new BRD feature work?

[Clover_Blake]

I'm really bad at playing music, so whatever the system, I'll fail at it. But I'm looking forward to seeing all these people playing songs in the major cities, even forming bands once more instruments are added ( * - * )
Eorzea is going to become more lively.

EDIT: Nora raises a good point in her reply. I hadn't considered this, but people could easily spam or troll with this system. Hopefully, a function to disable the sound will be added as well, as she suggested.