Most folks are sort of familiar with Neil Hefti's theme from the 1960s Batman TV show. But as the video below points out, the Dark Knight was not the only one with a song. Frank Gorshin as The Riddler had one too, and it is...definitely weird.
Although I always thought that Gorshin was the one Batman TV villain who could have translated from the camp of the show into the play-it-straight style of the movies. He already had the psychotic manner down pat and just needed a little tweak to make it menacing. And he sure as heck would have been better than the ridiculous version served up by Jim Carrey in Batman Forever. For your enjoyment: