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In this 1910 experiment, nine musicians played the "Blue Danube" waltz and other selections while farm hands milked 61 Jerseys and Holsteins.
The result: "The music calmed the nerves of the cows and their udders let down all the milk in them." Also, this milk "tasted better and had a more happy effect upon the drinkers than the milk served which had not been 'music impregnated.'"
Why aren't the upscale food stores of today (like Whole Foods) selling music-impregnated milk? I'm sure there are people who would spend the extra money for it.