 A key difference between Spieloper and Singspiel on the one hand, and opera buffa on the other, is that the two former genres contain spoken dialogues instead of recitatives, which is why Conradin Kreutzer's "Das Nachtlager in Granada" and Friedrich von Flotow's "Martha" do not belong to this genre.Technically, a Spieloper is an opera with a comic plot and light, pleasant music, differentiating it from more serious opera.Similarly, there are special role types such as Spieltenor or Spielbass for singers with lighter voices and the ability to act in comedies.