[klipt]

I think these skills are to some degree learnable.

That orchestra conductor probably spent a large part of their life studying music. Part of learning music is ear training: the ability to name/write chords by hearing them, and conversely to "hear" them in one's imagination given the name (or from written music). No different than the way many people "hear" words in their head when reading.

[Tor3]

They are, indeed, learnable. Even a mediocre amateur musician like myself learned to 'hear' the music when reading simple scores. Took a while though. But it's useful. I can look through score music and pick the ones I like, without having to actually play from the score first. Pros and orchestra conductors are on an entirely different level of course.