Two days ago, at the Salle Cortot in Paris, Final Fantasy XV and Kingdom Hearts (on top of a gazillion of other works) Yoko Shimomura held a concert titled "Melodiosa," and among other things it included music from the upcoming chapter of the Final Fantasy saga.

Shimomura played the piano herself for the Night Battle theme from the game, and the audience was also graced with more pieces, including some from Kingdom Hearts, performed by  the Sinfonia Pop Orchestra, Pianist Benyamin Nuss and Vocalist Estelle Micheau.

You can enjoy them all yourself in the videos below, courtesy of YouTube user saiyanangel5. Unfortunately, the acoustics are far from perfect, but it's much better than nothing.

[Thanks for the tip: Chantal]