Music streaming services like Spotify have become the go-to for many music fans, even those who listen to music a lot. But bottom line, you need to own copies of the music you consider essential in whatever format you prefer, or your ability to hear it on demand might disappear overnight. 

A few weeks ago I read an article on SoulTracks.com that talked about finding out that a specific album, one that you may even have 'saved' to your library, is no longer available on Spotify (or another streaming music service). In it, the author described his experience of having tracks he had located on Spotify and added to his playlist suddenly disappear from the streaming service. No notice. No explanation