I had in mind Conductors who worked in the pre stereo era when I made the thread, but that is a weird cut off point, because many of the greats of previous generations worked so long that they straddled both eras. And I didn’t mean it to be comprehensive either, just thought those three would kick off a discussion.
I actually have seen Solti and Bernstein in concert, formative events in my listening history. I remember seeing Barbirolli and Klemperer on TV. So they all seem less remote than someone like Furtwangler or Mengelberg.
Interpret the rules as you wish!
The big Bruno Walter box has really boosted my love for him. I remember those recordings being available on the execrable vinyl of Columbia Budget label. Hearing them freshly scrubbed is a revelation.
we should also add Szell, Ormandy, and Koussevitsky to the list