20th Century. Bart˘k's Allegro Barbaro, composed in 1911 is one of his most famous solo piano works, written in his typical style using folk elements based on Hungarian Pentatonic and Romanian chromatic scales. The music has even been used on a composition by the Progressive rock group "Emerson, Lake and Palmer" from their 1970 debut album. Sauer's arrangement is reminiscent of the famous trombone passage from the Miraculous Mandarin ballet suite.