This song is titled "Ulduar", a parody song (and video) written and performed by Summergale and Cranius of World of Warcraft fame, with a video done by Legs.
You may wish to give credit to Summergale and Cranius on YouTube, Warcraft Movies, etc., and on Summergale and Cranius' respective websites.
Such as:
Ulduar
Summergale and Cranius
http://www.youtube.com/watch?v=3hgcy6 bsg4g (Summergale's Youtube Upload, video by Legs, links to Cranius' site and Legs' site provided)
... followed by your description that you sped up the track.