Sounds pretty good if you're a Boost Mobile customer
Team it up with 99c for 3 months membership
https://www.apple.com/au/apple-music/membership/
MUSIC IS EVERYTHING!
With Apple Music you can listen to over 40 million songs; get new music first as well as handpicked playlists and of course, create and share your own playlists. To make it even better, Boost customers can now listen to Apple Music without using any data!
How to start streaming music data free with Boost Mobile
Join Boost Mobile first if you’re new (grab a SIM, activate it, then recharge on any plan);
Sign up to Apple Music; and
If you have an active recharge, then data free music streaming will automatically be applied.
Apple Music Compatibility
iPhone or iPad with iOS 8.4 or higher; watchOS and TVOS
Mac & PC via iTunes
Android 4.3 or higher
SONOS (Controller build 6.2.2 or higher)
Thanks OP
On another note, It would be nice if google music was data free too