This was the question my wife asked after I installed and set-up our Sonos speakers and digitised our music library. I explained that everything was now stored on the NAS behind the TV cabinet and streamed to the speakers over the Sonos network via the house WiFi and Internet connection. Anything we don't own can now be streamed through Google Play Music (Spotify got dropped after I discovered it doesn't have a way to filter explicit tracks - even after 3 years and 85 pages of requests in the Spotify support forum!) - we don't own it, no CD or anything, but can play it (and millions of other tracks) anytime we like over the Internet. I showed her how to push things into the queue, find and play radio stations, etc. but she just can't seem to get her head around not using any media. It's not that she can't understand how it works, it is just a real difficulty getting her head around the concept of no media; nothing tangible, no disc in her hand, no tray to slide in/out to receive the disc. Having grown up with records (singles and LPs), tape, and CDs she just isn't yet comfortable with music just being "there" instead of there, in her hand. A week later I finally retired the little tape/CD/radio unit to the shed and the wife is resignedly accepting that things have moved on - although there is one redeeming feature; she loves being able to use her iPad to remotely mute the speaker in Little Ms. Admin's room so she can get her attention!