This question already has an answer here:

It would seem like that would have been A from a logical stand point. Does anyone know the origin of this as to how music evolved this way with C being the so-called starter key? Just a curiosity on my part as nobody I know has ever had this answer.

marked as duplicate by Caleb Hines, leftaroundabout, MattPutnam, Matthew Read Apr 6 '16 at 14:39

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Browse other questions tagged or ask your own question.