Which opera has more parts including acts and tableaux, Le roi d'Ys or Stiffelio?
Le roi d'Ys Le roi d'Ys ("The King of Ys") is an opera in three acts and five tableaux by the French composer Édouard Lalo, to a libretto by Édouard Blau, based on the old Breton legend of the drowned city of Ys. That city was, according to the legend, the capital of the kingdom of Cornouaille.
Les petits riens Les petits riens ("The Little Nothings"; the lowercase in the original title is authentic) was a ballet in one act and three tableaux by Jean-Georges Noverre, with music by Wolfgang Amadeus Mozart, created at the Academie Royale de Music in Paris on 11 June 1778.