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.

Let me give you an 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.
The answer to this example can be: Who believes Fagin's gang make wallets and handkerchiefs?.
Here is why: 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.

OK. solve this:
Passage: Alkan's large scale Duo (in effect a sonata) Op. 21 for violin and piano (dedicated to Chrétien Urhan) and his Piano Trio Op. 30 appeared in 1841. Apart from these, Alkan published only a few minor works between 1840 and 1844, after which a series of virtuoso works was issued, many of which he had played at his successful recitals at Érard and elsewhere; these included the Marche funèbre (Op. 26), the Marche triomphale  (Op. 27) and Le chemin de fer (also published, separately, as Op. 27). In 1847 appeared the Op. 31 Préludes and his first large-scale unified piano work, the Grande sonate Les quatre âges (Op. 33). The sonata is structurally innovative in two ways; each movement is slower than its predecessor, and the work anticipates the practice of progressive tonality, beginning in D major and ending in G♯ minor. Dedicated to Alkan Morhange, the sonata depicts in its successive movements its 'hero' at the ages of 20 (optimistic), 30 ("Quasi-Faust", impassioned and fatalistic), 40 (domesticated) and 50 (suffering: the movement is prefaced by a quotation from Aeschylus's Prometheus Unbound). In 1848 followed Alkan's set of 12 études dans tous les tons majeurs Op. 35, whose substantial pieces range in mood from the hectic Allegro barbaro (no. 5) and the intense Chant d'amour-Chant de mort (Song of Love – Song of Death) (no. 10) to the descriptive and picturesque L'incendie au village voisin (The Fire in the Next Village) (no. 7).A number of Alkan's compositions from this period were never performed and have been lost. Among the missing works are some string sextets and a full-scale orchestral symphony in B minor, which was described in an article in 1846 by the critic Léon Kreutzer, to whom Alkan had shown the score. Kreutzer noted that the introductory adagio of the symphony was headed "by Hebrew characters in red ink ... This is no less than the verse from Genesis: And God said, Let there be light: and there was light." Kreutzer opined that, set beside Alkan's conception, Joseph Haydn's Creation was a "mere candle (lampion)." A further missing work is a one-act opera, mentioned frequently in the French musical press of 1846-7 as being shortly to be produced at the Opéra-Comique, which however never materialized. Alkan also referred to this work in a letter of 1847 to the musicologist François-Joseph Fétis, stating that it had been written "a few years ago." Its subject, title and librettist remain unknown.
Answer:
What is the last name of the person who had successful recitals at Érard and elsewhere?