In 1959 Berry Gordy left the Ford motor factory in Detroitto begin his own music production company. Motown became a giant force in the history of pop and a weapon in the American racial struggle. In the first of two programmes, Stephen Evans travels to "Motor City" Detroit, to meet the likes of Gladys Knight and Martha Reeves , who were involved with the company's early SUCCeSS. Producer Paul Evans (R)