 "Ad nos" is an extended fantasia, Adagio, and fugue, lasting over half an hour, and the Prelude and Fugue on B-A-C-H includes chromatic writing which sometimes removes the sense of tonality.Liszt also wrote some smaller organ works, including a prelude (1854) and set of variations on the first section of movement 2 chorus from Bach's cantata "Weinen, Klagen, Sorgen, Zagen, BWV 12" (which Bach later reworked as the "" in the Mass in B minor), which he composed after the death of his daughter in 1862.He also wrote a Requiem for organ solo, intended to be performed liturgically, along with the spoken Requiem Mass.