BHWW Yes, that character totally sounds like someone doing an impression of Ray Romano, except that they don't. Really, you've embarassed yourself here.
Caminante Nocturno I think there are SAG rules against impersonating yourself.
If there aren't, there should be.
Bort The original version of Marceline's song (plus the version in this clip) can be heard here:
http://www.poetv.com/video.php?vid=90925
I'm guessing they didn't go with the original version because it was a bit too on-the-nose for too many kids out there.