Leo Satan!
This is a great song and the only thing I have to complain about is how it just ends too quickly! It would have been cool if you put in the audio clip of Leo saying something at the end. When I first listen to it, it sounds a lot like "Kneel Satan". Looking at the entries and the title, I can pretty sure it's actually "Leo Satan". This is appropriate for the series, because it sets up the role of Satan in this. I am glad you got help from people like (Happy?)Harry.
I don't know much about how audio submissions are done, but you could have credited them if you wanted to. While short, that has rarely stopped an audio piece from being great before. You could have maybe cut off the last couple of seconds as it's just silence. I look forward to new episodes of "Leo & Satan". It's popular stuff like that that keeps the website going.