The Little Sweep—A Children's Opera in three scenes Op. 45: Scene One: A January Morning: VI. Marching Song: "Sooty tracks upon the sheet" (Children, Miss Baggott, Black Bob & Clem) by Heather Begg , Catherine Benson , Choral Scholars of King's College, Cambridge , Finchley Children’s Music Group , Cato Fordham , Robert Lloyd , Richard Morton , Catherine Wearing , The Medici Quartet , Philip Ledger