The document discusses the development of the piano and romantic piano music. It describes how the piano was improved in the 19th century, becoming louder and more responsive. This allowed the emergence of virtuoso performers and salon music. Composers like Chopin and Schumann explored the technical capabilities and expressive potential of the piano through character pieces and short lyric works. A focus is placed on Chopin's études, particularly the Revolutionary Étude which musically depicted his distress over events in Poland.