purchased music
How to get access to music purchased under a different appleid
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Then you need to sign in with that different Apple ID.
If you don't have that different Apple ID anymore, It is not possible.
Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.
You can’t merge multiple Apple ID accounts.