Ken Ludwig wrote 
Midsummer/Jersey, a mash-up of Shakespeare's 
A Midsummer Night's Dream and 
Jersey Shore.
Review . Granted, it's not a musical.
There have already been two movies about 9/11 created. My wife and I started watching the Nicolas Cage one (World Trade Center) and after about 10 minutes, I couldn't watch it anymore. I've seen one staged reading of a 9/11 survivor's book, 
That Day in September. 
James Bond, the Musical? Harry Potter, the Musical? iPad, the Musical?