It’s not every day that writers, even highly popular writers, get a personal message from a Knight. But that’s exactly what happened when Sir Paul McCartney surprised Glee co-creator Ryan Murphy with a mixed tape recently. Murphy dished on the details at a recent press conference for the show.

“It just sort of came out of the blue,” he said of the tape, which was accompanied by a personal note. “It said ‘Hi Ryan. I’d hope you’d considered these songs for Glee.”

The two-disc mix is full of tracks, some of which will make a definite appearance on the series. Murphy said of the correspondence, “I was gobsmacked. Of course we’re going to do something.”