Arp Schnitger’s early modern examples of this instrument inspired a 20th-century “reform” movement that championed Baroque practices such as the use of high-pitched mixtures. A piece of music for this instrument begins with the three notes “G, high D, long B-flat” (10[1])and has the common nickname “little.” The “Orpheus of Amsterdam,” Jan Pieterszoon (-5[1])Sweelinck (“yahn Peters-sown SWAY-link”), was renowned as a performer (10[1])of this instrument. An 18th-century Büchlein (“BYOOKH-line”) of music for this instrument consists of chorale preludes. The (10[1])Lübeck virtuoso Dieterich (10[1])Buxtehude’s (10[2])(“book-stuh-HOO-duh’s”) skill on this instrument prompted an arduous journey by a composer who later wrote a Passacaglia and Fugue in C minor for it. For 10 points, name this primary instrument of J. S. Bach, which usually contains multiple keyboard manuals and a pedalboard. (10[1])■END■ (0[1])