Episode five is about one of the ways we organize human knowledge. It's also about two German musicologists who created a system for categorizing musical instruments, before the Nazis fucked it all up. And you bet it's relevant to the development of the guitar, because in the Hornbostel Sachs system, the guitar is barely a blip among the hundreds of tools humans use to make music. And if that's the case, why is the guitar...everywhere?

As we get into this long history, it's important to maintain a sense of humility.

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