[bjoli]

I think one problem that the people with extreme sensitivity have is that not only choruses but also orchestras drift in pitch.

I work professionally, and some orchestras are extreme. My orchestra usually starts at a at 442 but end up at 443,5 but I have played in places that start 441 and end up above 445. Good orchestras with very good reputation.

Some are extreme at the other end. I played with the Munich Phil and despite the concert being a killer for every woodwind and brass instrument involved, we didn't drift a cent despite the hall being almost 28c and the end of the concert.

A colleague (now retired) had the crazy kind of perfect pitch where he could say the note and how many cents off it was. At least to something like a 5 cent sensitivity.

Back before we switched to LED lighting that must have been horrible. The stage r got crazy hot during concerts, and I remember having to struggle to not end up at 446.