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Billboard magazine reports that Kelly Clarkson’s current hit “Piece by Piece” marks the singer’s 100th chart-topper, counting all national, domestic music charts (current, recurrent and catalog) compiled by the magazine — the first for an “American Idol” contestant. Gaining high notoriety from her Feb. 25 performance on Fox’s “American Idol”, “Piece by Piece”, Clarkson’s autobiographical […]