I am pretty sure I read that before. I was wondering if say Engineer, or Producer belongs at release level vs recording level.
I guess either would work, however if there is a remaster version of the same album then being on recording level might have many relationships that may not be applicable.
Take the original link I posted in this thread as an example.
Daniel Licht is the composer and performed many instruments on the album, which instrument per track I do not know, so I assume release is best for this.
A fully written guide of what goes where, why and that gets updated to deal with outliers, would be helpful. Relying on users to do their best for a standardized database doesn't seem good.