On: Perceptions of musical octaves are learned, not wired in the brain

[gpvos]

I don't play accordion but I understand they have multiple reeds for the same note, which are usually tuned slightly off, relative to each other.

[mrob → gpvos]

It's also standard in pipe organs, where it's called "celeste". See:

http://www.organstops.org/c/Celeste.html