Importing Music library from MBP 2015 to MBP 2024

The Music app in Sonoma allows the import of locally stored media, and ripping content from CD (assuming you attach an optical drive). See Import music from a computer to Music on Mac - Apple Support and Import songs from CDs into Music on Mac - Apple Support. If you want to retain your playlists, play counts, ratings, etc. then you should open the existing library with the newer app rather than import the media into an otherwise empty library. Once the library has been updated by, say, Sonoma, it will no longer be accessible from Monterey, though you can keep a backup copy of the compatible library.

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See Move your iTunes library to a new computer - Apple Community.

Upgrading to Monterey, or from pre-Mojave iTunes

Music in Monterey sometimes has trouble processing iTunes libraries and will stall on import. Newer versions of Music may also decline to convert older iTunes libraries. In such cases the library may need to be converted first by iTunes in Mojave and/or Music in Catalina, before it can be recognized in the newer version of Music. If you don't have access to suitable hardware or software for these conversions I may be able to help via an exchange of emails. See address in my profile.

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You're welcome. 🙂

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