This is an interesting little story I saw, and even kind of 50th Anniversary-relevant, I would say:
http://www.guardian.co.uk/music/2013/mar/22/paul-mccartney-dr-who-yesterday Of course Sir Macca also has to get a little dig in at Lennon. I wonder if he even knows he's doing it?
Ah well, too bad it didn't come to pass - what might have been...