<P>Musicians make music. Producers make records. In the early days of recorded music, the producer was the «artists-and-repertoire man,» or A&amp;R man, for short. A powerful figure, the A&amp;R man chose both who would record and what they would record. His decisions profoundly shaped our musical tastes. Don Law found country bluesman Robert Johnson and honky-tonk crooner Lefty Frizzell. Cowboy Jack Clement took the initiative to record Jerry Lee Lewis (while his...