Plenty, but I think a better argument would be 'how many industries force you to buy their entire product line instead of a single item?'. It's like going to McDonald's and having to buy a Big Mac and Fries when all you wanted was a shake.
The music industry is suffering through one of the worst slumps in its history and blames the rise of digital music for its much of its pain.
Hogwash. The music industry could be taking advantage of the digital music medium to offer singles online instead of entire CD's full of music their customers don't want.