Task: Question Generation
Input (English): Passage: Work on the steel structure of the RCA Building started in March 1932. Meanwhile, the British and French governments had already agreed to occupy the first two internationally themed buildings, and John Rockefeller Jr. started signing tenants from the respective countries. The cornerstone of the British Empire Building was laid in June, when Francis Hopwood, 1st Baron Southborough, placed the symbolic first stone in a ceremony. Significant progress on the theaters had been made by then: RKO Roxy's brickwork had been completed and the limestone-and-granite facade was almost ready to be installed, while the Music Hall's steelwork was complete. By September, both theaters were almost finished, as was the RCA Building, whose structural steel was up to the 64th floor. That month also saw the opening of the RKO Building, the first structure in the complex to be opened. The British Empire Building's structural steel started construction in October.The Music Hall was the second site to open, on December 27, 1932, although it had topped out in August. This was followed by the RKO Roxy's opening two days later. Roxy originally intended to use the Music Hall as a vaudeville theater, but the opening of the Music Hall was widely regarded as a flop, and both theaters ended up being used for films and performing arts. Radio City's Roxy Theatre had to be renamed the Center Theatre in May 1933 after a lawsuit by William Fox, who owned the original Roxy Theatre on 50th Street. The failure of the vaudeville theater ended up ruining Roxy's enterprise, and he was forced to resign from the center's management in January 1934.The cornerstone of La Maison Francaise was laid on April 29, 1933, by former French prime minister Édouard Herriot. The British Empire Building was open less than a week later. The RCA Building was slated to be open by May 1, but was delayed because of controversy over the Man at the Crossroads mural in the lobby. In July 1933, the managers opened a 70th-story observation deck atop the RCA Building, It was a great success: the 40-cents-per-head observation deck saw 1,300 daily visitors by late 1935.Work on the rooftop gardens started in October 1933, and La Maison Francaise opened the same month. In December 1933, workers erected the complex's famed Christmas tree in the center of the plaza for the first time. Since then, it has been a yearly tradition to display a large Christmas tree at the plaza between November and January.Simultaneously, the city built the part of the canceled "Metropolitan Avenue" that ran through Rockefeller Center. The new street, called "Rockefeller Plaza", was projected to carry an estimated 7,000 vehicles per day upon opening. The first segment, between 49th and 50th streets, opened in 1933, and a northern extension opened in 1934. The new street measured over 60 feet (18 m) wide and ran 722 feet (220 m) through the complex, with four vehicular levels.
Output (English): What are the names of the theaters that ended up being used for films and performing arts?