In a former life I was part of a church choir (smallish church, ~140 members, everyone knew everyone). Same guy was running the orchestral band I had been a part of for a long time (trumpet, also had piano background), and they needed members.. A quick tryout and he told me to join the bass section - without taking into account I had a cold that day. I struggled to hit a lot of the notes, but then moved to tenor and easily hit most of the notes, almost being lead tenor for a while. Sure, it was a falsetto, but I could hit high A or C pretty reliably, IIRC.
Moved to the west coast (this was great lakes area) and something about the air is different, and while I stayed in choir for a few years, eventually lost the top octave entirely and am now a horrible singer (I used to be ok and could, for example, easily sing Livin' on a Prayer - I can't come close to it now). If I go back to the great lakes area, after a week, my singing voice has improved tremendously, only to lose it when I return. I do miss being able to sing better, but not enough to move back..