Did Beethoven Write Any Disco?

So asks the composer of Sister Act, Alan Menken, at the end of an interview with Jasper Rees in the Telegraph. And an excellent question it is, too. It puts me in mind of this post by Stephen Fry and the following musical truth:

"You can't dance to Beethoven"

The point being that pop music is meant to be danced to and classical music listened to, give or take. Musical theatre has always existed in a bit of a twilight zone between the two, borrowing happily from both; it is determinedly middlebrow. I'm sure that, had Beethoven ever written any disco, it most certainly have ended up in a musical.