 Liszt wrote his two largest organ works between 1850 and 1855 while he was living in Weimar, a city with a long tradition of organ music, most notably that of J.S.Bach.Humphrey Searle calls these works—the Fantasy and Fugue on the chorale "Ad nos, ad salutarem undam" and the Prelude and Fugue on B-A-C-H—Liszt's "only important original organ works" and Derek Watson, writing in his 1989 "Liszt", considered them among the most significant organ works of the nineteenth century, heralding the work of such key organist-musicians as Reger, Franck, and Saint-Saëns, among others.