The physical process of a needle reading music from a piece of plastic vinyl is a physical process. A piece of vinyl is actually a musical object in itself. Information read from a CD is essentially just re-presentation of digital information.

That's how I feel about it anyway.

I wonder if all the CDs would get wiped in a nuclear explosion. That happened in a film I saw. All the digital information vanished and everything stopped working. They were using clockwork radios and crank-start cars.