Country music is booming in Britain. In America, country artists enter the Pop charts at No. 1. Here is a compendium of all of country music's great performers, writers, muscians and producers, among them Tammy Wynette, Roy Orbison, Patsy Cline, K d Lang, Dolly Parton, Willie Nelson ...It includes names not normally associated with country - Bob Dylan, The Rolling Stones, Elvis Presley and Costello, and Ray Charles - and enbraces related genres, such as Cajun and bluegrass.