This is an orchestrated version of the main theme from first Kingdom Hearts. When it appeared in the game’s original trailer over a decade ago, it was just as breathtaking as the concept: an epic crossover between all of the major Disney movies. However, you’d be hard-pressed to find a Disney movie with this kind of soundtrack; the Kingdom Hearts theme remains one of Yoko Shimomura’s finest works. This particular version was done by the Crouch End Festival Chorus and the Slovak National Symphony Orchestra.
Good gaming, good music.