This part does not apply to a county having a metropolitan form of government with a population of more than five hundred thousand (500,000), according to the 2000 federal census or a subsequent federal census; provided, that this part applies to a privately owned or operated museum principally dedicated to the preservation of cultural heritage, achievements, and contributions of minority artists, musicians, composers, or other fine arts practitioners located within such county.
T.C.A. § 67-4-3009