Country Joe and the Fish were headliners at the Northwest's Great Piano Drop in 1968, as well as the Sky River Rock Festival and Lighter than Air Fair a few months later. Sky River was a forerunner of Woodstock, where they also played

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The Great Piano Drop of 1968

How this local stunt has ties to Woodstock

In a roundabout way, the Great Piano Drop, which led to Sky River, can probably take a little credit for Woodstock