VGFacts

Someone pointed this out in the Comment section of the Kingdom Hearts Video but the music that plays during the Kingdom of Corona's dancing Mini-game in KH3 greatly resembles the background music heard when the player enters Carwen Town in Final Fantasy V:

Here's the Kingdom Hearts III Mini-Game:

https://www.youtube.com/watch?v=Nw2fPd_BEGY

And here is footage of Final Fantasy V's Carwen Town:

https://www.youtube.com/watch?v=_GVERv0Titc

I'd say it's legitimate! It is Kingdom Hearts and Final Fantasy after all!!