Here's a new music classification system for organizing your iPod playlists. Quentin Tarantino's theory, put forth by Uma Thurman in Pulp Fiction (directors cut), is that you're either an Elvis person or a Beatles person. I would propose that there are also two styles of music: Muppets and other. Doesn't matter if it's angst or Hank, the key question is: can the Muppets dance to it?