Task: Question Generation
Input (English): Passage: Bach is known as a prolific composer of cantatas. When he assumed the position as Thomaskantor (director of church music) in Leipzig in 1723, he began the project to write church cantatas for the occasions of the liturgical year – Sundays and feast days – a project that he pursued for three years.Bach was appointed organist and chamber musician in Weimar at the court of the co-reigning dukes in Saxe-Weimar, Wilhelm Ernst and his nephew Ernst August on 25 June 1708. He had composed sacred cantatas before, some during his tenure in Mühlhausen from 1706 to 1708. Most were written for special occasions and were based mainly on biblical texts and hymns. Examples include: Aus der Tiefen rufe ich, Herr, zu dir, BWV 131; the early chorale cantata Christ lag in Todes Banden, BWV 4 for Easter; Gott ist mein König, BWV 71, to celebrate the inauguration of the new city council on 4 February 1708; and the Actus Tragicus for a funeral.
In Weimar, Bach first concentrated on the organ, composing major works for the instrument, including the Orgelbüchlein, the Toccata and Fugue in D minor, BWV 565, and the Prelude and Fugue in E major, BWV 566. Christoph Wolff suggests that Bach may have studied musical material belonging to the Hofkapelle, ("court capelle" or court orchestra), and that he copied and studied works by Johann Philipp Krieger, Christoph Graupner, Georg Philipp Telemann, Marco Giuseppe Peranda and Johann David Heinichen in the period from 1711 to 1713. In early 1713 Bach composed his first cantatas in the new style that included recitatives and arias: the so-called Hunting Cantata, BWV 208, as a homage cantata for Christian, Duke of Saxe-Weissenfels, celebrated on 23 February, and possibly the church cantata for Sexagesima (the second Sunday before Lent) Gleichwie der Regen und Schnee vom Himmel fällt, BWV 18, on a text by Erdmann Neumeister.In 1713, he was asked to apply for the position of music director of the Marktkirche in Halle, succeeding Friedrich Wilhelm Zachow. Zachow had taught the young George Frideric Handel, and  composed many church cantatas in the new style, adopting recitatives and arias from the Italian opera. Bach was successful in his application for the position, but declined after Duke Wilhelm Ernst increased his salary and offered him a promotion.
Output (English): What is the last name of the person who was said to have copied and studied works by Johann Philipp Krieger?