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- In the closing scene of Wagner's Lohengrin, Slezak had sung his Farewell, and was about to make his departure in the boat drawn by a swan. The boat moved away before Slezak could step on board. He glanced at the audience. 'Tell me,' he said, 'what time is the next swan?'
- What Time's the Next Swan? (1962) by Walter Slezak