Change Apple ID tied to music on iPhone

All purchases and subscriptions are tied to the Apple ID used when making the purchases or setting up the subscription. You can try setting up Family Sharing between the IDs if you want to be able to share purchases made with the IDs. For any subscriptions, you need to cancel the existing subscription on the old ID and take out a new subscription on the new Apple ID.

Family Sharing.   *

ASC YouTube for Family Sharing

Family Sharing - Set up.  *

Family Sharing - Set up on iPhone.  -

Family Sharing - Set up Family Sharing in the Apple TV app.  -