Import into macOS 10.15 Catalina's Apple Music does not work: unknown error -54; likely root cause: file access permissions
The following procedure removed the problem:


In Finder, select /Users/myaccount/Music/iTunes, the "Get Info".
Current permissions are me: Read &amp; Write, system: Read &amp; Write, wheel: Read only, everyone: Read only. (I apparently mad a mistake in the earlier observation that only me had Read &amp; Write permission there.)
Select "Apply to enclosed items".