Over across the silver lake the figures of the negroes writhed and squirmed in the moonlight like acrobats who, having been too long inactive, must go through their tacks from sheer surplus energy. In single file they marched, weaving in concentric circles, now with their heads thrown back, now bent over their instruments like piping fauns. And from trombone and saxaphone ceaselessly whined a blended melody, sometimes riotous and jubilant, sometimes haunting and plaintive as a death-dance from the Congo's heart.