As an April Fools’ joke, Marc-André Hamelin announced his fake recording of a set of exercises mostly written in this key, Charles-Louis Hanon’s The Virtuoso Pianist. (10[1])A unison horn duet opens a symphony in this key that is most likely the same piece as its composer’s mysterious “Gmunden-Gastein” (“g’MOON-din gah-STYNE”) Symphony. A “beautiful girl” usually plays a metronomic line in a piece partially named for this key, which calls for a group of about 35 players. (10[2])After reviewing its manuscript, Robert Schumann praised the “heavenly length” of a “Great” symphony in this key by Schubert. A piano “pulse” underscores 53 cells in a minimalist piece titled for this major key by Terry Riley. The dominant scale degree of this key is G. For 10 points, name this major key with no sharps or flats. ■END■ (10[1])