What is the question to: "Other examples include European "textural" compositions of the fifties and sixties such as Krzysztof Penderecki 's Threnody to the Victims of Hiroshima (1959) and Gyorgy Ligeti 's works featuring micropolyphony in works like Atmospheres (1961) and his Requiem (1963-65)."? The topic is Sound mass.
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Answer: "what composer used sound mass?"

What is the question to: "It started with four teams and, through a series of expansions, contractions, and relocations, the league is now composed of 30 active franchises."? The topic is National Hockey League.
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Answer: "how many professional hockey teams in canada?"

What is the question to: "The Emancipation Proclamation was an order issued to all segments of the Executive branch (including the Army and Navy) of the United States by President Abraham Lincoln on January 1, 1863, during the American Civil War ."? The topic is Emancipation Proclamation.
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Answer:
"when did abraham lincoln write the emancipation proclamation???"