text: A piano piece of this type in A minor begins with a four-bar lento fragment of the main theme before suddenly switching to allegro con brio for the rest of the piece.
full_question: A piano piece of this type in A minor begins with a four-bar lento fragment of the main theme before suddenly switching to allegro con brio for the rest of the piece. Claude Debussy's first book of these pieces is organized by intervals, and the first piece in that book was inspired by Carl Czerny. Franz Liszt wrote "Paysage" and "Feux Follets" as two of his (*) 12 exceedingly difficult "Transcendental" pieces of this type. Pieces of this type make up Frederic Chopin's Opus 10 and 25, which include ones nicknamed "Winter Wind" and "Tristesse," as well as a piece supposedly inspired by Poland's November Uprising, which is often called the "Revolutionary." For 10 points, name these pieces which focus on improving technique.
first_sentence: A piano piece of this type in A minor begins with a four-bar lento fragment of the main theme before suddenly switching to allegro con brio for the rest of the piece.
raw_answer: etudes [or studies]