“One Saturday in 1994, Bennie Lydell Glover, a temporary employee at the PolyGram compact-disk manufacturing plant in Kings Mountain, North Carolina, went to a party at the house of a co-worker. He was angling for a permanent position, and the party was a chance to network with his managers. Late in the evening, the host put on music to get people dancing. Glover, a fixture at clubs in Charlotte, an hour away, had never heard any of the songs before, even though many of them were by artists whose work he enjoyed.”