Sharing music on different Apple devices
How can I have the same music currently on my iPad also on my iPhone and my computer iTunes?
iPhone XR, iOS 13
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Assuming you do not subscribe to either Apple Music or iTunes Match (if you do, you may use those services and iCloud to keep your library updated on each device), you keep your music collection updated on your iPhone and iPad from your computer.
Sync your iPhone, iPad, or iPod using your computer - Apple Support