Missing Music
I signed out and signed back in to Apple Music now on Catalina, and everything disappeared and won't come back; it has stayed in tact on all my other devices. Anybody have a solution?
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Verify that "Sync Library" is still checked on the General tab of Preferences in the Music app.
If it is unchecked, check it - but it might take some time for your music to show up again after re-enabling it.