Right now you can get a free 30 day trial of Amazon Music Unlimited. This is a new music streaming service from Amazon that includes no ads and unlimited access to tens of millions of songs. Basically you can play any song you want at any time!!
This gets even better if you an Echo. You can tell it a lyric and it will find you the song. How cool is that?
After your trial, Amazon Prime members pay $7.99/month for the service.