I changed my apple ID and i’m trying to change my apple music over.
How would I go about changing my apple music over to my new Apple ID?
If you changed the Mail address for your Apple ID, as explained in this article, there are a few more things to do:
Change your Apple ID - Apple Support
What to do after you change your Apple ID or password - Apple Support
In case you created a completely new Apple ID, you'll have to subscribe again to Apple Music, and cancel the subscription for the old Apple ID.