Problem: A cappella:

The Swingle Singers used nonsense words to sound like instruments, but have been known to produce non-verbal versions of musical instruments. Like the other groups, examples of their music can be found on YouTube. Beatboxing, more accurately known as vocal percussion, is a technique used in a cappella music popularized by the hip-hop community, where rap is often performed a cappella also. The advent of vocal percussion added new dimensions to the a cappella genre and has become very prevalent in modern arrangements. Petra Haden used a four-track recorder to produce an a cappella version of The Who Sell Out including the instruments and fake advertisements on her album Petra Haden Sings: The Who Sell Out in 2005. Haden has also released a cappella versions of Journey's "Don't Stop Believin'", The Beach Boys' "God Only Knows" and Michael Jackson's "Thriller". In 2009, Toyota commissioned Haden to perform three songs for television commercials for the third-generation Toyota Prius, including an a cappella version of The Bellamy Brothers' 1970s song "Let Your Love Flow".[citation needed]

What did the Swingle Singers primarily use to emulate musical instruments?
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A: nonsense words

Problem: After secretly crossing the Yalu River on 19 October, the PVA 13th Army Group launched the First Phase Offensive on 25 October, attacking the advancing UN forces near the Sino-Korean border. This military decision made solely by China changed the attitude of the Soviet Union. Twelve days after Chinese troops entered the war, Stalin allowed the Soviet Air Force to provide air cover, and supported more aid to China. After decimating the ROK II Corps at the Battle of Onjong, the first confrontation between Chinese and U.S. military occurred on 1 November 1950; deep in North Korea, thousands of soldiers from the PVA 39th Army encircled and attacked the U.S. 8th Cavalry Regiment with three-prong assaultsfrom the north, northwest, and westand overran the defensive position flanks in the Battle of Unsan. The surprise assault resulted in the UN forces retreating back to the Ch'ongch'on River, while the Chinese unexpectedly disappeared into mountain hideouts following victory. It is unclear why the Chinese did not press the attack and follow up their victory.
When did the Chinese and US military have their first confrontation in Korea?
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Answer: 1 November 1950

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The boroughs of Liverpool, Knowsley, St Helens and Sefton were included in Merseyside. In Greater Manchester the successor boroughs were Bury, Bolton, Manchester, Oldham (part), Rochdale, Salford, Tameside (part), Trafford (part) and Wigan. Warrington and Widnes, south of the new Merseyside/Greater Manchester border were added to the new non-metropolitan county of Cheshire. The urban districts of Barnoldswick and Earby, Bowland Rural District and the parishes of Bracewell and Brogden and Salterforth from Skipton Rural District in the West Riding of Yorkshire became part of the new Lancashire. One parish, Simonswood, was transferred from the borough of Knowsley in Merseyside to the district of West Lancashire in 1994. In 1998 Blackpool and Blackburn with Darwen became independent unitary authorities.
In what year was Skipton Rural District made part of Lancashire?
A: unanswerable

Context and question: The Rajpath which was built similar to the Champs-Elysees in Paris is the ceremonial boulevard for the Republic of India located in New Delhi. The annual Republic Day parade takes place here on 26 January.
What is the name of the ceremonial boulevard for the Republic of India in New Delhi?
Answer: The Rajpath

Question: Since the late 19th century, most treaties have followed a fairly consistent format. A treaty typically begins with a preamble describing the contracting parties and their joint objectives in executing the treaty, as well as summarizing any underlying events (such as a war). Modern preambles are sometimes structured as a single very long sentence formatted into multiple paragraphs for readability, in which each of the paragraphs begins with a verb (desiring, recognizing, having, and so on).
Is there an answer to this question: What is the beginning of a typical treaty called?

Answer: a preamble

QUES: Early reviews were mixed in their assessment. Ken Tucker of Entertainment Weekly considered that "As TV, American Idol is crazily entertaining; as music, it's dust-mote inconsequential". Others, however, thought that "the most striking aspect of the series was the genuine talent it revealed". It was also described as a "sadistic musical bake-off", and "a romp in humiliation". Other aspects of the show have attracted criticisms. The product placement in the show in particular was noted, and some critics were harsh about what they perceived as its blatant commercial calculations Karla Peterson of The San Diego Union-Tribune charged that American Idol is "a conniving multimedia monster" that has "absorbed the sin of our debauched culture and spit them out in a lump of reconstituted evil". The decision to send the season one winner to sing the national anthem at the Lincoln Memorial on the first anniversary of the September 11 attacks in 2002 was also poorly received by many. Lisa de Moraes of The Washington Post noted sarcastically that "The terrorists have won" and, with a sideswipe at the show's commercialism and voting process, that the decision as to who "gets to turn this important site into just another cog in the 'Great American Idol Marketing Mandala' is in the hands of the millions of girls who have made American Idol a hit. Them and a handful of phone-redialer geeks who have been clocking up to 10,000 calls each week for their contestant of choice (but who, according to Fox, are in absolutely no way skewing the outcome)."

What publication does Ken Tucker work for?
What is the answer?
ANS:
Entertainment Weekly