Official comment
@Salva > iTunes doens't exist in Catalina; you need to manually export the XML from the Music application and then point rekordbox to that XML (it's not updated automatically).
After upgrading to rekordbox 6, I am no longer able to view my iTunes library within the app (no playlists load).
I keep both my iTunes and rekordbox libraries on an external drive, and the iTunes Library XML and Database Management paths are correctly set in rekordbox preferences.
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macOS Catalina 10.15.4
iTunes 12.9.5.5
rekordbox 6.0.0 rev.18624-16955-16959
@Salva > iTunes doens't exist in Catalina; you need to manually export the XML from the Music application and then point rekordbox to that XML (it's not updated automatically).
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Thanks for the reply.
I was having issues with Music.app when I upgraded to Catalina, so I installed iTunes via Retroactive (https://github.com/cormiertyshawn895/Retroactive/).
So rekordbox 6 just assumes the XML is from Music.app if it sees the OS is Catalina? Wouldn't it make more sense read the app/version info that is contained within the XML to determine how to parse the library data?
Totally understand I'm an edge case, just a bit frustrating since the app supports older versions of macOS and can presumably parse an iTunes library XML.