IN the grand tradition of Angel, 30 Rock and Community, the kids of Glee will be “Muppeted” in this new episode. Or is that Muppetised? Or Avenue Q’ed? Either way, they’ll be turned into felt puppets. Just when you thought Glee couldn’t get any more sugary! As for the songs in this episode, expect Madonna’s Into the Groove, Simple Minds’ Don’t You ( Forget About Me), Queen’s You’re My Best Friend and a Janet Jackson mash- up.