The Elder Scrolls.
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Legal Stuff:
Music by Kevin MacLeod.  MacLeod's music is free to use on YouTube according to his site.
This can be verified at http://incompetech.com/m/c/royalty-free/faq.html

The music is Licensed under Creative Commons "Attribution 3.0"
http://creativecommons.org/licenses/by/3.0/

Song used:
Five Armies
http://incompetech.com/music/royalty-free/index.html?keywords=USUAN1100875&Search=Search