Original: The variations differ sharply : a running line , a set of close harmonies , a march , a polonaise , and a ragtime allegro ; the interludes are one of the first uses of bitonality ; Swafford , p. 63 ; there is some doubt that the published interludes are exactly what Ives wrote at seventeen , but there are other , even earlier , bitonal sketches .
Simplified: The variations differ sharply : a running line , a set of close harmonies , a march , a polonaise , and a ragtime allegro ; the interludes are one of the first uses of bitonality .