There are evidently songs in existence that have been sung by "me". While the voice and subject matter suggest this is true, I can assure you it isn't. Still, they are vaguely interesting.
This one is mildly acceptable.
This one surpasses its mate somewhat.
They are both vaguely amusing. I believe there are two of Grimmjaw as well, though I don't have them, and several for the humans and shinigami. This fandom thing seems to have too much time on its hands--as, recently, do I. Aizen-sama, do you have no more legitimate tasks for me to complete?