Any big change of tempo is emphatic and will catch the attention. You may scarcely be conscious that a passenger train is moving when it is flying over the rails at ninety miles an hour, but if it slows down very suddenly to a ten-mile gait your attention will be drawn to it very decidedly. You may forget that you are listening to music as you dine, but let the orchestra either increase or diminish its tempo in a very marked degree and your attention will be arrested at once.
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