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.

[EX Q]: Passage: Time-Life also wanted to expand, as its existing space in 1 Rockefeller Plaza had become insufficient by 1953. In August of that year, Rockefeller Center Inc. bought a tract of land on the west side of Sixth Avenue between 50th and 51st streets. Rockefeller Center's managers originally wanted to build an extra NBC studio or a Ford vehicle showroom on the site. However, they changed their minds once they saw Time Inc.'s expansion needs: the company wanted to have its headquarters in a single building. As they would outgrow their existing space in 1 Rockefeller Plaza by 1954, the company would have to move elsewhere. Not wanting to lose Time Inc.'s tenancy, the complex's managers hired Harrison & Abramovitz, composed of Wallace Harrison and Max Abramovitz, to create plans for a building on the newly acquired plot that could house both NBC and Time. NBC later dropped out of the deal because its CEO, David Sarnoff, dissented.In 1956, two years after the demolition of the Center Theatre, officials announced the construction of a new tower, the Time-Life Building, on the western side of Sixth Avenue between 50th and 51st Streets. The 500-foot (150 m), $7 million building ($97.2 in 2018 dollars) would include connections to the existing passageway system and to the Roxy Theater directly to its west. The tower would rise as a 48-story slab, with a plaza to the east and an eight-story annex along its western and northern sides. One of Rockefeller Center's subsidiaries, Westprop Inc., bought the air rights to the original Roxy Theater located next door so that the new tower could conform to the Zoning Resolution of 1916. Time Inc. and Rockefeller Center formed a joint venture, Rock-Time Inc., which would share the tower's rent income between them. Construction on the Time-Life Building's steelwork started in April 1958, and the structure topped out in November of that year. The cornerstone of the building was laid in June 1959, after the building's structure had been completed, and the first tenants began moving into the tower in December 1959.During this time, plans called for Rockefeller Center to expand northward. Rockefeller Center, Uris Buildings Corporation, and Webb and Knapp formed another joint venture, Rock-Uris Corp., to construct a hotel to the west of 75 Rockefeller Center. However, Webb and Knapp faced monetary shortages, and the joint venture found that a hotel was not the most profitable use of the land. The joint venture instead decided to construct a glass-and-concrete 43-story office building on the site, with connections to the complex's underground concourse. In 1961, the building was named after Sperry Corporation, which leased eight floors in the future building. The planned hotel was moved to another site two blocks north, on the west side of Sixth Avenue between 53rd Streets. This became the New York Hilton at Rockefeller Center, which opened in 1963. The hotel's name was misleading because it was located outside the complex and not connected to the underground mall. The mall could not be extended anyway because the 53rd Street subway was in the way. Further expansion of Rockefeller Center on the west side of Sixth Avenue, between the Hilton and the new Time-Life Building, was not possible because the Equitable Life Assurance Society had built a tower in between the two properties. 
Question: What building's cornerstone was laid in June 1959?
[EX A]: the Time-Life Building.

[EX Q]: Passage: Igor Stravinsky was the son of Fyodor Stravinsky, the principal bass singer at the Imperial Opera, St Petersburg, and Anna, née Kholodovskaya, a competent amateur singer and pianist from an old-established Russian family. Fyodor's association with many of the leading figures in Russian music, including Rimsky-Korsakov, Borodin and Mussorgsky, meant that Igor grew up in an intensely musical home. In 1901 Stravinsky began to study law at Saint Petersburg University while taking private lessons in harmony and counterpoint. Stravinsky worked under the guidance of Rimsky-Korsakov, having impressed him with some of his early compositional efforts. By the time of his mentor's death in 1908 Stravinsky had produced several works, among them a Piano Sonata in F♯ minor (1903–04), a Symphony in E♭ major (1907), which he catalogued as "Opus 1", and a short orchestral piece, Feu d'artifice ("Fireworks", composed in 1908).In 1909 Feu d'artifice was performed at a concert in St. Petersburg. Among those in the audience was the impresario Sergei Diaghilev, who at that time was planning to introduce Russian music and art to western audiences. Like Stravinsky, Diaghilev had initially studied law, but had gravitated via journalism into the theatrical world. In 1907 he began his theatrical career by presenting five concerts in Paris; in the following year he introduced Mussorgsky's opera Boris Godunov. In 1909, still in Paris, he launched the Ballets Russes, initially with Borodin's Polovtsian Dances from Prince Igor and Rimsky-Korsakov's Scheherazade. To present these works Diaghilev recruited the choreographer Michel Fokine, the designer Léon Bakst and the dancer Vaslav Nijinsky. Diaghilev's intention, however, was to produce new works in a distinctively 20th-century style, and he was looking for fresh compositional talent. Having heard Feu d'artifice he approached Stravinsky, initially with a request for help in orchestrating music by Chopin to create the ballet Les Sylphides. Stravinsky worked on the opening "Nocturne" and the closing "Valse Brillante"; his reward was a much bigger commission, to write the music for a new ballet, The Firebird (L'oiseau de feu) for the 1910 season.Stravinsky worked through the winter of 1909–10, in close association with Fokine who was choreographing The Firebird. During this period Stravinsky made the acquaintance of Nijinsky who, although not dancing in the ballet, was a keen observer of its development. Stravinsky was uncomplimentary when recording his first impressions of the dancer, observing that he seemed immature and gauche for his age (he was 21). On the other hand, Stravinsky found Diaghilev an inspiration, "the very essence of a great personality". The Firebird was premiered on 25 June 1910, with Tamara Karsavina in the main role, and was a great public success. This ensured that the Diaghilev–Stravinsky collaboration would continue, in the first instance with Petrushka (1911) and then The Rite of Spring. 
Question: What is the full name of the person that impressed Rimsky-Korsakov with their early compositional efforts?
[EX A]: Igor Stravinsky.

[EX Q]: Passage: Igor Stravinsky was the son of Fyodor Stravinsky, the principal bass singer at the Imperial Opera, St Petersburg, and Anna, née Kholodovskaya, a competent amateur singer and pianist from an old-established Russian family. Fyodor's association with many of the leading figures in Russian music, including Rimsky-Korsakov, Borodin and Mussorgsky, meant that Igor grew up in an intensely musical home. In 1901 Stravinsky began to study law at Saint Petersburg University while taking private lessons in harmony and counterpoint. Stravinsky worked under the guidance of Rimsky-Korsakov, having impressed him with some of his early compositional efforts. By the time of his mentor's death in 1908 Stravinsky had produced several works, among them a Piano Sonata in F♯ minor (1903–04), a Symphony in E♭ major (1907), which he catalogued as "Opus 1", and a short orchestral piece, Feu d'artifice ("Fireworks", composed in 1908).In 1909 Feu d'artifice was performed at a concert in St. Petersburg. Among those in the audience was the impresario Sergei Diaghilev, who at that time was planning to introduce Russian music and art to western audiences. Like Stravinsky, Diaghilev had initially studied law, but had gravitated via journalism into the theatrical world. In 1907 he began his theatrical career by presenting five concerts in Paris; in the following year he introduced Mussorgsky's opera Boris Godunov. In 1909, still in Paris, he launched the Ballets Russes, initially with Borodin's Polovtsian Dances from Prince Igor and Rimsky-Korsakov's Scheherazade. To present these works Diaghilev recruited the choreographer Michel Fokine, the designer Léon Bakst and the dancer Vaslav Nijinsky. Diaghilev's intention, however, was to produce new works in a distinctively 20th-century style, and he was looking for fresh compositional talent. Having heard Feu d'artifice he approached Stravinsky, initially with a request for help in orchestrating music by Chopin to create the ballet Les Sylphides. Stravinsky worked on the opening "Nocturne" and the closing "Valse Brillante"; his reward was a much bigger commission, to write the music for a new ballet, The Firebird (L'oiseau de feu) for the 1910 season.Stravinsky worked through the winter of 1909–10, in close association with Fokine who was choreographing The Firebird. During this period Stravinsky made the acquaintance of Nijinsky who, although not dancing in the ballet, was a keen observer of its development. Stravinsky was uncomplimentary when recording his first impressions of the dancer, observing that he seemed immature and gauche for his age (he was 21). On the other hand, Stravinsky found Diaghilev an inspiration, "the very essence of a great personality". The Firebird was premiered on 25 June 1910, with Tamara Karsavina in the main role, and was a great public success. This ensured that the Diaghilev–Stravinsky collaboration would continue, in the first instance with Petrushka (1911) and then The Rite of Spring. 
Question: What was the full name of the person that created a short orchestral piece called Feu d'artifice?
[EX A]:
Igor Stravinsky.