It was late on July 16, 1957, and Charles M. Bogert was in a recording booth in Highland County, Florida, with a pair of singers who wouldn’t sing. The burgeoning producer, who had left a busy life in New York to chase talent in the Sunshine State, had heard the two perform live that very evening, in a chorus of hundreds. He had plucked them from the crowd, and thenushered them out of the swampy night and into this soundproofed room. But his would-be stars—out of their element, lacking inspiration—were…