Puccini used Wagnerian leitmotifs to identify characters, objects and ideas. Sullivan sometimes used Wagnerian leitmotifs for both comic and dramatic effect. Burns frequently incorporates simple musical leitmotifs or melodies. Critics praised the music, including its effective melodies and leitmotifs set off by orchestral counterpoint. Although Davis rarely focuses on strong melodies, familiar leitmotifs from earlier in the series reappear. The music of "Salome" includes a system of leitmotifs, or short melodies with symbolic meanings. Character themes and leitmotifs gradually took on importance, despite being avoided earlier. These names often illustrate the ambiguity of certain leitmotifs. Since Wagner, the use of leitmotifs has been taken up by many other composers. However, the film was fully underscored, with instrumental snippets from the film's various leitmotifs throughout. Adam used several "leitmotifs" in the ballet. In his music, Steiner relied heavily on leitmotifs. The score contains no leitmotifs for the main characters. Labels for the leitmotifs are common, but there is no final authority. Extensive use is made of leitmotifs for the various characters.