I didn't think it was possible, but the Television Critics Association press tour this past weekend has given fans all new reasons to get excited over the musical-comedy Glee.

Though series creator Ryan Murphy reportedly told attendees at a TCA panel discussion he's scaling Glee back to concentrate on characters next year, it sounds like the beloved Emmy-nominated series still has plenty of outsized celebrity cameos in store for season 2.

Following in the footsteps of Madonna and Lady Gaga, another blonde pop diva is set to receive the hour-long Glee theme-episode treatment this year. Murphy confirmed Britney Spears will appear on an upcoming show, playing a perpetually dim student. Also in the works: a Christmas episode, which is rumoured to feature Britain's Got Talent songbird Susan Boyle in a role as a lunch lady at McKinley High.

While celebrity appearances - from Olivia Newton-John to Neil Patrick Harris - are nothing new on the spirited pop-tune-studded program, Murphy did mention one potential Glee collaborator who is officially tizzy-worthy. As Murphy told reporters on Monday, Paul McCartney recently contacted him, sending Murphy two mixed CDs of music along with a handwritten note that read: "Hi Ryan, I hope you will consider some of these songs for Glee." Though the Glee creator didn't spill any juicy details about a potential McCartney appearance, his remark "of course we are going to do something with him" suggests we will likely be hearing Lea Michele belting out at least one Beatles classic in near future.

I'm curious to hear from readers on this one. Which McCartney/Beatles songs would you most like to hear in an upcoming Glee episode?