Tom Lehrer wrote and recorded a number of very brilliant comedy songs but he has made his primary living as a professor of mathematics. Sometimes, he combines his two careers. Here's a link to a 13 minute homemade video of Mr. Lehrer singing a number of song parodies that relate to his academic side. You may not get all the references but how often do you get to see and hear Tom Lehrer at all, let alone performing material you've never heard before?