Google Play Music is offering 3-Months of Unlimited Subscription for Free [google.com]
(New Subscribers Only).
Note: Must sign into your Google account to purchase. Upon completion of your 3-Month trial, the monthly rate to continue service is $9.99. You may cancel at any time before your trial end date and still receive the full 3-Months of membership benefits without incurring further charges. Purchase of this subscription also includes access to YouTube Red.