One of Dieterich Buxtehude’s (“books-tuh-HOO-duh’s”) 19 pieces in this genre was written in F-sharp minor on an organ tuned in Werckmeister (“VERK-my-stur”) temperament due to its unplayability in meantone. The left hand’s sixteenth-note ostinato speeds up to presto in the second half of an E minor Bach piece in this genre, BWV 855. Louis Couperin left note lengths to the discretion of the performer in his “unmeasured” form of this genre. (10[1])46 hymns like Vom Himmel hoch (“fom HIM-mul hohkh”) were set as the “chorale” type of this genre in the Little Organ Book. Arpeggiated ascending C-major chords open a piece in this genre that Charles Gounod (“sharl goo-NOH”) quoted in his setting of Ave Maria. Bach paired pieces in this genre with fugues in his (-5[1])Well-Tempered (-5[2])Clavier. (10[1])For 10 points, name this musical genre that introduces another piece of music. ■END■ (10[4]0[3])