Performing at Barack Obama's presidential inauguration, whose voice has been declared a "natural resource" of the state of Michigan?

Michigan's Department of Natural Resources officially declared Aretha Franklin's voice the state's "natural resource" in 1985, as she lived much of her early life in Detroit. At Barack Obama's inauguration, she sang "America (My Country 'Tis Of Thee)" while wearing a Swarovski crystal-imbedded hat, which has since become its own celebrity.

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