Wow, I was not expecting a final fantasy rhythm game, of all things. Could be interesting. Strange name, but I guess it kind of works.
I'm guessing just combination of a phrase that they thought was too long "theatrical rhythm" at least they're no longer confusing people with Latin "whaat. numbers made from words? What is this tomfoolery you speak of little Asian man?"
Otherwise I am thoroughly confused and as such hope it comes with a dance mat for lols.