"My music tastes like cod," Edvard Grieg thought, referring to the salty Norwegian folk melodies that permeate his work. With African-American William Dawson, he has a kindred spirit. 'I hope the audience will hear that only a black could have written this,' he said of his Negro Folk Symphony (1934) - inspired by spirituals, West African rhythms and the history of 250 years of slavery. A revelation.