Some instruments don't take well to certain key signatures

I've learned from painful experience in my occasional forays into composing or arranging music for my church job that some keys simply don't suit some instruments (my orchestration basics are lost far back in the mists of time, and I'm almost always too lazy or frazzled to go back to my reference materials, which I've kept since university).

That means having to apologise to grimacing players at the one-and-only pre-performance rehearsal.

It never ocurred to me to do this, which Gretchen Michelle Helbig posted on Facebook: