I have a free Spotify account and installed both the desktop and mobile app. When I sign into my account on my iPhone and try to play a song, it says that only Premium users can do that. Ok, well, there's something else Free users can do; sync your songs that you already own on your computer to the Spotify app. So the syncing is not actually the copying of songs onto the iPhone, right?...Because you can just do that by syncing with iTunes. Is it instead, scanning your music library and seeing what songs you have and allowing you to stream those songs using Spotify?