How do I transfer my music to my new iPhone?
How do I transfer music to new iPhone
iPhone 8, iOS 13
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This will tell you how to transfer all of the contents to you new phone from the old one.
Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support
If you synced music that you imported from CD’s in iTunes to your old phone, you will have to sync the music to the new phone. It does not transfer from a backup.
Use iTunes to sync your iPhone, iPad, or iPod with your computer - Apple Support