I like how it starts out in A major then switches to E-flat major at the beginning, then it's E-flat minor from there. Personally, it makes me feel like we've been ascended into Heaven, and then going back to Hell to fight the darkness. But, then again, "Heaven can wait... There's still more work for us in Hell." Maybe that was the intended effect, or maybe it wasn't. Either way, it's a real nice darkening effect, and I personally like the heroic nature of the tune. Thank you, Bungie.