Given the task definition, example input & output, solve the new input case.
In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.
Example: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Question: Who believes Fagin's gang make wallets and handkerchiefs?
Output: Oliver.
In the sentence "He believes they make wallets and handkerchiefs", the pronoun "he" refers to name "Oliver".

New input case for you: Passage: In 1955, Paul Hindemith revised the work to achieve more clarity. According to Wolfgang Rathert, Hindemith "sought to moderate Reger's 'uncontrolled invention'", while Kirshnit described Reger's original scoring as "gloriously polychromatic". Hindemith "thinned" the orchestra, especially the horns. In Reger's scoring, the organ reinforced the voices throughout the piece, resulting in a lack of clarity for the polyphonic passages. Hindemith used the organ only for climaxes. In the double fugue, he assigned one theme to a voice, but the other simultaneous theme to the orchestra. Hindemith's approach, which enables more analytical listening, seems justified by Reger's own scoring of later compositions which were more refined and focused. It is probably due to his version that Der 100. Psalm enjoyed continuous presence in concert halls, while other works by Reger were neglected.Francois Callebout wrote an organ version that was published in 2004 by Dr. J. Butz. Gabriel Dessauer explains in the preface that Reger's work was conceived for oratorio choirs of up to 500 singers at the beginning of the 20th century. The organ version enables smaller choirs to perform the music. This version was premiered in 2003 by the Reger-Chor in St. Bonifatius, Wiesbaden, the parish to which the composer belonged during his studies in Wiesbaden. The organ was played by Ignace Michiels, organist at the St. Salvator Cathedral in Bruges.Hanns-Friedrich Kaiser, KMD (director of church music) in Weiden, where Reger grew up, wrote a version for choir and organ, which he conducted at the opening of the festival Reger-Tage at the church St. Michael on 16 September 2012, with organist Michael Schoch.
Question: What is the last name of the person who assigned one theme to a voice, and a simultaneous theme to the orchestra in the double fugue?
Output:
Reger.