Gladstone "Gladdy" Anderson

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Gladstone "Gladdy" Anderson (1934-2015) was a Jamaican pianist, keyboardist and session leader who played on hundreds of ska, rocksteady and reggae recordings and led Gladdy's All Stars. He is popularly credited with coining the term "rock steady" while describing Hopeton Lewis's "Take It Easy," a session he played on. Source note: Gladstone Anderson Wikipedia and Reggae Vibes obituary.