Paul McCartney: A Gleek?

Glee producer Ryan Murphy thought he was getting punked when he received a mixed tape from Paul McCartney.

"The package arrived with a handwritten note saying he hoped we could use his songs," Murphy told TV critics in Beverly Hills Monday.

Murphy says they will be taking Sir Paul up on his generous offer.

More Glee news: The Christmas episode will feature Susan Boyle, and yes, there's going to be a Britney Spears episode -- executed in a "very unusual way."