Catchy!
Making something epic is hard enough, but to make it loop and have the person playing the game not suffer from a mental breakdown and run screaming from the loop is hard enough! I have to say I would've liked to see the melody be carried to something faster paced and elaborate after the choir cuts in at :30 or so... such as a violin or electric guitar, the horns' buzz gets a little old after the second runthrough.
All in all, I think the biggest lesson can be learned from older games when it comes to music loops. I mean, who ever got sonic's invinciblity power up and complained of the 16-bit loop that may have lasted... 15 seconds or so? It feels like this should have either been simplified more, or had more added to it.