Lots of people here mentioning that concert pitch wasn't always A = 440 Hz. Here's an interesting 12tone video explaining how we ended up at exactly that: https

Lots of people here mentioning that concert pitch wasn't always A = 440 Hz. Here's an interesting 12tone video explaining how we ended up at exactly that: https://youtu.be/BzznBt8tVnI https://youtu.be/BzznBt8tVnI (Spoiler: It involves nothing less than the Treaty of Versailles.)