PHOTO: Cory Monteith Waiting To Sing For 'Glee'

There are so many big musical numbers on Glee that some of the stars can't even get in the studio!

Cory Monteith was forced to wait patiently to enter the recording studio for the hit FOX show, and a crew member posted the above photo on Twitter of Monteith sitting on a trash can with the caption, "@frankenteen waiting patiently in line to sing. We ran out of chairs," referring to Monteith's Twitter name.

The show will return with a new episode on Sunday after the Super Bowl, with a performance of the Destiny's Child hit "Bills, Bills, Bills" by Chris Colfer and Darren Criss. There will also be a mashup of Michael Jackson's iconic "Thriller" with the Yeah Yeah Yeahs' "Heads Will Roll," and an appearance from Katie Couric. —ISHITA SINGH