Problem: Hard rock:

The roots of hard rock can be traced back to the 1950s, particularly electric blues, which laid the foundations for key elements such as a rough declamatory vocal style, heavy guitar riffs, string-bending blues-scale guitar solos, strong beat, thick riff-laden texture, and posturing performances. Electric blues guitarists began experimenting with hard rock elements such as driving rhythms, distorted guitar solos and power chords in the 1950s, evident in the work of Memphis blues guitarists such as Joe Hill Louis, Willie Johnson, and particularly Pat Hare, who captured a "grittier, nastier, more ferocious electric guitar sound" on records such as James Cotton's "Cotton Crop Blues" (1954). Other antecedents include Link Wray's instrumental "Rumble" in 1958, and the surf rock instrumentals of Dick Dale, such as "Let's Go Trippin'" (1961) and "Misirlou" (1962).

When was "Rumble" released?
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A: 1958


Problem: An influential school of phonology in the interwar period was the Prague school. One of its leading members was Prince Nikolai Trubetzkoy, whose Grundzüge der Phonologie (Principles of Phonology), published posthumously in 1939, is among the most important works in the field from this period. Directly influenced by Baudouin de Courtenay, Trubetzkoy is considered the founder of morphophonology, although this concept had also been recognized by de Courtenay. Trubetzkoy also developed the concept of the archiphoneme. Another important figure in the Prague school was Roman Jakobson, who was one of the most prominent linguists of the 20th century.
What was Nikolai Trubetzkoy's publication?
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Answer: Principles of Phonology


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In August 1836, two real estate entrepreneurs—Augustus Chapman Allen and John Kirby Allen—from New York, purchased 6,642 acres (26.88 km2) of land along Buffalo Bayou with the intent of founding a city. The Allen brothers decided to name the city after Sam Houston, the popular general at the Battle of San Jacinto, who was elected President of Texas in September 1836. The great majority of slaves in Texas came with their owners from the older slave states. Sizable numbers, however, came through the domestic slave trade. New Orleans was the center of this trade in the Deep South, but there were slave dealers in Houston. Thousands of enslaved African-Americans lived near the city before the Civil War. Many of them near the city worked on sugar and cotton plantations, while most of those in the city limits had domestic and artisan jobs. In 1860 forty-nine percent of the city's population was enslaved. A few slaves, perhaps as many as 2,000 between 1835 and 1865, came through the illegal African trade. Post-war Texas grew rapidly as migrants poured into the cotton lands of the state. They also brought or purchased enslaved African Americans, whose numbers nearly tripled in the state from 1850 to 1860, from 58,000 to 182,566.
Who bought land along Buffalo Bayou to build a city?
A: Allen brothers


Context and question: Near the northern Greek borders there are also some Slavic–speaking groups, locally known as Slavomacedonian-speaking, most of whose members identify ethnically as Greeks. Their dialects can be linguistically classified as forms of either Macedonian Slavic or Bulgarian. It is estimated that after the population exchanges of 1923, Macedonia had 200,000 to 400,000 Slavic speakers. The Jewish community in Greece traditionally spoke Ladino (Judeo-Spanish), today maintained only by a few thousand speakers. Other notable minority languages include Armenian, Georgian, and the Greco-Turkic dialect spoken by the Urums, a community of Caucasus Greeks from the Tsalka region of central Georgia and ethnic Greeks from southeastern Ukraine who arrived in mainly Northern Greece as economic migrants in the 1990s.
Where are Slavic speaking groups generally found?
Answer: northern Greek borders


Question: His parents set aside specific times at breakfast and at dinner for daily family Bible reading. Chores were regularly assigned and rotated among all the children, and misbehavior was met with unequivocal discipline, usually from David. His mother, previously a member (with David) of the River Brethren sect of the Mennonites, joined the International Bible Students Association, later known as Jehovah's Witnesses. The Eisenhower home served as the local meeting hall from 1896 to 1915, though Eisenhower never joined the International Bible Students. His later decision to attend West Point saddened his mother, who felt that warfare was "rather wicked," but she did not overrule him. While speaking of himself in 1948, Eisenhower said he was "one of the most deeply religious men I know" though unattached to any "sect or organization". He was baptized in the Presbyterian Church in 1953.
Is there an answer to this question: What is another name for the International Bible Students Association?

Answer: Jehovah's Witnesses


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Many of the instruments used to perform medieval music still exist, but in different forms. Medieval instruments included the wood flute (which in the 21st century is made of metal), the recorder and plucked string instruments like the lute. As well, early versions of the organ, fiddle (or vielle), and trombone (called the sackbut) existed. Medieval instruments in Europe had most commonly been used singly, often self accompanied with a drone note, or occasionally in parts. From at least as early as the 13th century through the 15th century there was a division of instruments into haut (loud, shrill, outdoor instruments) and bas (quieter, more intimate instruments).
Medieval instrument in Europe were commonly used how?
A:
singly