Thanks for reaching out to the Apple Support Communities! It sounds like you are having an issue using your free trail of Apple Music with Family Sharing on your device and I am more than happy to help! First, check out this article with steps for How to force an app to close on your iPhone, iPad, or iPod touch and close the Music app. Once that is done, Restart your iPhone, iPad, or iPod touch then check to see if you are still seeing the issue in Music.