About an hour ago we heard a waltz by Johann Strauss Jr. Later this morning we’ll hear waltzes by Johann Strauss and Richard Strauss. We’ll also hear a waltz by a French composer who described his work with this preface: “Through whirling clouds, waltzing couples may be faintly distinguished. The clouds gradually scatter: one sees an immense hall peopled with a whirling crowd. The scene is gradually illuminated. The light of the chandeliers bursts forth. Set in an imperial court, about 1855.”  Name the composer and the work.