Within a few years, the radical composer-pianist Leo Ornstein became one of the most famous figures in classical music on both sides of the Atlantic for his performances of cutting-edge work. In 1914, Ornstein debuted several of his own solo piano compositions: "Wild Men's Dance" (aka "Danse Sauvage"; 1913–14), "Impressions of the Thames" ( 1913–14), and "Impressions of Notre Dame" ( 1913–14) were the first works to explore the tone cluster in depth ever heard by a substantial audience. "Wild Men's Dance", in particular, was constructed almost entirely out of clusters (). In 1918, critic Charles L. Buchanan described Ornstein's innovation: " gives us masses of shrill, hard dissonances, chords consisting of anywhere from eight to a dozen notes made up of half tones heaped one upon another."