I always preferred the Feymarch's music. I feel it fits the mystic realm your in, and marks the true turning point of the game, from a story about a bunch of misfits to the story of heroes for forgo their pasts to save their futures.
Simply put, Kingdom Hearts' variant. Specifically Kingdom Hearts II's version, as Cloud's appearance with the other wing really helps seal the fact these two were cut from the same thread.
PSN: Lumanarem
Steam: Playon999
XBL: Lumanare
Origin: Lumanaremaxima
yeah... pretty much look up Lumanare on, well, ANY major gaming service, and I'm probably there.