fredneil.livejournal.com
I tried playing through it. I don't recognize the melody, but the first part is fairly coherent if you play it in B and keep the A natural throughout. My guess is that the artist just copied from whatever sheet music he had at hand. After the break for Clark's head, it looks like he's copying from a completely different piece. (I didn't even try playing that one. I have no idea what key it's in, but it's definitely not B.)