Check out either Doubletwist or iSyncer, both of which not only put your music onto your S7 but also sync your playlists.
Or just use Google Play Music. There is an app that you can install on your Mac that runs in the background and uploads/matches all of your tunes from iTunes into the Google Play Music cloud library. Then you can either stream your music that way or "pin" songs/albums to your device, which downloads them to your phone. It allows up to 50,000 songs to be uploaded. That app on your mac will continue to run anytime you add a new song and automatically add it. Unfortunately, it doesn't sync playlists and it doesn't sync play counts, etc.