how do I change my Apple ID on my Apple Music app on my Mac
how do I change my Apple ID on my Apple Music app on my Mac
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You can sign out of one Apple ID, and then sign in with another, if that is what you're asking, however switching between IDs to access past content from more than one account can create issues due to a feature called association. See See Authorization vs. association - Apple Community for details.
See Change your Apple ID - Apple Support if you want to change the email address associated with your Apple ID.
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