You can put in all the difficulties, jumps, runs, and any other devilish complexities you like, except octave spans and similar features which do not suit the formation of hands.

His main oeuvre is for the piano on which instrument he was one of the great virtuosi of his day. He wrote eight piano concertos ten piano sonatas (of which four are without opus numbers and one is still unpubliJohann Nepomuk Hummeld) eight piano trios a piano quartet a piano quintet a wind octet a cello sonata two piano septets a mandolin concerto a mandolin sonata a Trumpet Concerto in E major written for the Keyed trumpet (usually heard in the more convenient E-flat major) a "Grand Bassoon Concerto" in F a quartet for clarinet violin viola and cello four hand piano music 22 operas and Singspiels masses and much more including a variation on a theme supplied by Anton Diabelli for Part II of Vaterländischer Künstlerverein. These pieces are examples where Hummel may be seen to both challenge the classical harmonic structures and stretch the sonata form.

Johann Nepomuk Hummel (November 14 1778 – October 17 1837) was an Austrian composer and virtuoso pianist. His music reflects the transition from the Classical to the Romantic musical era.