Can’t stop the music
Record companies will probably get the current standard CD to disappear over the next decade in favor of a new format that makes digital copying impossible without much hassle/hacking by the end user. But that won’t stop the trade of MP3s, or whatever successor format consumers choose. The ability to copy music once it reaches the analog stage in your stereo or PC will always exist. And that output can be stored digitally. At its most rudimentary this can involve connecting your stereo’s AUX or headphone jack to your PC’s microphone port. More sophisticated is software like TotalRecorder, which captures music on your PC from CDs, Internet radio or just about any other source, intercepting the signal as it heads out of your sound card and to your speakers.