CHICAGO (Reuters) - Blues musician "Little" Milton Campbell, whose gritty vocals and songwriting recalls B.B. King's rough-edged style, was in a coma after suffering a stroke, a friend said on Wednesday. The 71-year-old Grammy-nominated guitarist and singer known for writing and recording the blues anthem "The Blues Is Alright" suffered a stroke July 27 and lapsed into a coma at a Memphis, Tennessee, hospital, friend Larry Chambers said in a telephone interview. Born to sharecropping farmers near the Mississippi Delta town of Inverness -- his father, "Big" Milton Campbell, was a local blues musician -- "Little" Milton picked up a...