In a living, oral tradition, material changes. Each person who tells a story or sings a song will add something, or leave something out. It’s easy to see this in action as there are so many songs that share features. They may have the same tune and chorus but different verses. They may tell the same story, but with a different tune and words. Sometimes you do it to keep the language contemporary. Sometimes you do it because what rhymes in one accent doesn’t in another.
There’s a natural selection process in stories as well. For example, there are many older versions of the Cinderella story, and they don’t all have glass slippers. For some reason, the glass slipper was a detail/innovation a lot of people liked, and it stuck.
Every traditional piece was at some point first created by someone, or perhaps by a small group. The idea that…
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