An idea I don't want to forget....
https://www.pianostreet.com/smf/index.php?topic=54351.msg586983#msg586983Re: can you learn perfect pitch?
I had an idea....
Perfect pitch is the color. Relative pitch listening overpowers that at some point for whatever reason for most people. (taking a guess there)
But you could shift. If you stopped using relative pitch, what's left? Probably some undeveloped... other form of listening, which could include pitch color. You probably wouldn't know what's happening or it would feel very unfamiliar. You might not even notice your brain registering things that way.
But how do you turn off relative pitch?
Easy way -- Listen/feel the expression/emotion in the music. At least for me. What does it remind me of? How does it make me feel? I don't know what the notes are. I don't know what key is, etc. But those are kind of notes that pop out later randomly, for me at least. I know that one note I just heard is the same as x-note in y-piece.
Engrained further by repeated listenings.
Emotions turn off the relative pitch listening. Add depth. I notice my brain can focus in a little more deeply on notes. Strange effect. It's like something else is switched off.