I have an icon called both "Music" and "Play Music" on my S4. What's the difference? I have been moving music files from my computer into the "Music" folder, but when I download a song from Play Store I find it under the "Play Music" icon. So if I'm going to use teh Play Music icon to find all my songs, how do I move them from my computer onto it instead of the "Music" icon? I got away from the iPhone because I hated iTunes and the problems with doing this kind of transfer between my computer and smartphone. Surely there has to be an easier way to move songs around with the S4.