Answer:
I'm not sure, maybe try googling this, it seems like a better fit.
Explanation:
The "Copper" was used by the First Nations people as a form of money and wealth. It was made out of "Native" copper which was found in the land where they lived, and superficially resembled a shield. Considered very rare and hard to obtain, raw copper was traded from the Athabaskan Indians in the Interior Plains, or from the white man in later times.
I believe John Cage is linked with aleatoric music.
Hope I helped! :)
