Somehow I doubt that Arnold Schwarzenegger's singing voice sounds as good as the guy singing in this comedic spoof, but then again I can barely understand Arnold when he's actually trying to enunciate every word, so I guess a vocal stand-in was necessary.
Batman and Robin- The Musical definitely would have been a bigger hit than Spider Man-The Musical for sure, if only because of this one line-- "Batman-You Son Of A B***H!". (Warning-NSFW due to foul language).
--via Nerdist