Google Music is a great way to sync your music library across all your devices. And the storage is great for anything but a music fanatic. At the time of writing this, they allow syncing 100,000 songs or tracks. See the video below for adding folders to Google Play Music. Once they are uploaded, you just need to download the app on your tablet or smartphone, and sign in with the same account you’re signed into on the desktop and as they begin to upload, you’ll see them in the library 🙂