WHENEVER HE MADE records under his own name, Bobby Sheen, who has died aged 57, was out of luck. But as Bob B Soxx, the ostensible leader of a group called the Blue Jeans, he briefly became one of the figures identified with the Wall of Sound, the style of pop music devised in the early 60s by the record producer Phil Spector, whose musical innovations and eccentric behaviour also established the archetype of the brilliant and autocratic Svengali of early rock and roll.