Gershwin incorporated several different piano styles into his work. He utilized the techniques of stride piano, novelty piano, comic piano, and the song-plugger piano style. Stride piano's rhythmic and improvisational style is evident in the "agitato e misterioso" section, which begins four bars after rehearsal 33, as well as in other sections, many of which include the orchestra. Novelty piano can be heard at rehearsal 9 with the revelation of the Train theme. The hesitations and light-hearted style of comic piano, a vaudeville approach to piano made well known by Chico Marx and Jimmy Durante, are evident at rehearsal 22.