Hi @Justincase thanks for posting to community!
Sorry for any confusion over the Music Unlimited feature with MetroPCS.
Music Unlimited is included in the $40 rate plan at no extra charge, allowing you to stream as much music as you want on your smartphone from top streaming services and it won’t count towards your 4G LTE data plan. However, Music Unlimited does not include the music subscription, this will need to be purchased separately.
For more information on Music Unlimited with MetroPCS, I would recommend contacting their support team directly here.
Thanks again for posting to community!