Given the task definition, example input & output, solve the new input case.
In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
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.
Output: Who believes Fagin's gang make wallets and handkerchiefs?.
This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.

New input case for you: Passage: During Leopold's illness performances were impossible, so Wolfgang turned to composition. According to the writer and musician Jane Glover, Wolfgang was inspired to write symphonies after meeting Johann Christian Bach. It is not clear when this meeting occurred, or when Wolfgang first heard J. C. Bach's symphonies, although he had played the older composer's harpsichord works in his May 1764 royal recital. Wolfgang soon completed his Symphony No. 1 in E flat, K. 16, and started his No. 4 in D major, K. 19 (which Zaslaw concludes was more likely composed, or at least completed, in The Hague). The D major symphony has, in Hildesheimer's words, "an originality of melody and modulation which goes beyond the routine methods of his [grown-up] contemporaries". These are Wolfgang's first orchestral writings, although Zaslaw hypothesises a theoretical "Symphony No. 0" from sketches in Wolfgang's musical notebook. Three lost symphonies, identified in the Köchel catalogue of Mozart's works only by their incipits (first few bars of music), may also have originated from the London period. Other works composed by Wolfgang in London include several instrumental sonatas, the jewel of which, according to Hildesheimer, is the C major sonata for piano, four hands, K. 19d. A set of violin sonatas, with extra flute and cello parts, was dedicated to Queen Charlotte at her request, and presented to her with an appropriate inscription in January 1765. Wolfgang also wrote his first vocal works, the motet "God is our Refuge", K. 20, and the tenor aria Va, dal furor portata, K. 21.
Output:
What was the last name of the older composer who Wolfgang played their harpsichord works in his May 1764 royal recital?