I think TLS Guy's points do have some merit, although he does deliver them with a dose of audio snobbery. Many classical recordings do have a much wider dynamic range than most pop music recordings, but there is more to it than that. Many classical recordings also have a reference point for their sound, ie they are trying to capture the sound of a certain venue. They are trying to make the music sound lifelike in the sense that is what you would hear in good seats in a concert hall. Pop music, on the other hand, isn't recorded to sound like anything that would be realistically be heard in real life. The 'scene' created by most pop music occurs in a purely psychic space. Mostly it is just recorded so all the notes, lyrics, and sound are heard clearly, and is not trying to recreate a real life acoustic space. As such, there is no reference point for the way it is supposed to sound, at least if you are not the recording engineer.