Based on what we've seen of Glee, the show doesn't need any guest-starring stunts to reel in viewers this fall.
But this sounds intriguing:
Hit singer Josh Groban will make a cameo on the series. According to the star, he'll play a version of himself on the show that is an “absolute jerk.”
That's all we can report for now, but considering the down-to-earth, humble persona Grobin has established for himself, we can't wait to find out what this entails.