Oh wow, a Harmony of Heroes track? Is this the first time the album's been mentioned on OCRemix? Glad for this; I only found about Harmony of a Hunter (and 101% Run) because OCRemix posted a bunch of the tracks, and people really oughta hear about this album (and Final Smash).
My favourite part of Dark Horizons has got to be from 4:08 to 4:38, where "Dark World" is playing again, it gets all triumphant, and then suddenly whips to a "Hyrule Castle" cameo.