Richard Rodgers and Oscar Hammerstein II knew the power of Oklahoma's wind in 1947 when they wrote of it "sweepin' down the plain" in the show tune "Oklahoma!" The lyrics resonated so well with Okies that the Legislature declared it the official state song in 1953. More than half a century later, wind's still sweepin' down the plain, and it has joined "the wavin' wheat" as an Oklahoma cash crop.
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