I'm still wondering why the dragons would create this kind of song about the only person that they fear (going by the trailer). I don't know a lot of races who ask for the blessing of the person meant to stop them.
Unless dragons just happen to share the language Alduin and friends speak (and they are actually against Alduin) or that a cleaver Nord wrote that in Draconic to scare them.
I was thinking the same, it must have been written by Nords. But if I understand it right, there'll be a civil war between them going on as well? Maybe the song isn't supposed to have been written by anyone, it's just there for the game.
Probably not the right thread to discuss this in.
edit: I should have realized that you have to write faster in order to not get ninja'd x5 right now.