It's not a Deadmau5 song. It's a remix. Every "Deadmau5" tune people have linked to in efforts to defend him has been a collaboration of some sort, i.e. Kaskade + DeadMau5, that remix. I'm yet to see anyone suggest a track that he produced and recorded solo which shows he has anything more than the ability to make mediocre electronic music. The recent stuff could even be classified as a bit pop.
What about this?
http://www.youtube.com/watch?v=w9ATrc6MbUg