Somebody has to pay the dues, says La Vern Baker. Here are the remarkable stories of six dazzlingly talented performers who blazed the R & B trail -- the story of the performers' music and also of their struggle against racism and financial exploitation: Ruth Brown and La Vern Baker, two of the most popular female black singers of the 1950s...Little Jimmy Scott, whom Madonna calls the only singer who ever really made her cry...Charles Brown, master...