How to handle this specific case of custom post type?

The question is: How do you want to handle it?

From what I understand, you’re currently trying to build up a song (“track post”) database, from which users should be able to pick from for their playlists. With every user being able to add new songs.

You could solve this in a similar fashion to how StackExchange works: add a Community user. Whenever a song is created, its ownership gets transferred to the Community user. Then add custom capabilities which refer to that Community user. Who can edit posts, who delete, …?

In this basic version, it might turn out that a user is not able to edit/delete a song s/he initially created. You can even achieve that by saving the original creator as a meta field, hooking into user_has_cap.

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