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In page Moss Hart:

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The last show Hart directed was the Lerner and Loewe musical Camelot (1960). During a troubled out-of-town tryout, Hart had a heart attack. The show opened before he fully recovered, but he and Lerner reworked it after the opening. That, along with huge pre-sales and a cast performance on The Ed Sullivan Show, helped ensure the expensive production was a hit.[citation needed]