Today, Google brought it's A-game with a subscription service for Play Music. Now, you can pay a $9.99 monthly fee to get unlimited access to a library of music. It also comes with a new, updated Play Music app that doesn't look like complete garbage. There's also a host of features including the ability to turn any track into a radio station.
The one key way that this service distinguishes itself from other subscription services is that this includes all of your own personal music. In other words, the MP3s you've purchased and own are in the same app as all the music you've added to your library via your subscription.