I like having my music offline. I'll never have a spotify account or give up buying discs and/or records and/or downloading MP3s and having them in my actual collection. The idea of everyone relying on Spotify to have their music at the ready is rather horrifying, in the same way that it's frightening to be surrounded by people who have no plan for when the electricity goes out. Taking it a step further and building out another system to track the virtual collection of music I don't actually own seems outright crazy to me.