In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: In a 1991 interview, Zappa reported that he was a registered Democrat but added "that might not last long—I'm going to shred that". Describing his political views, Zappa categorized himself as a "practical conservative". He favored limited government and low taxes; he also stated that he approved of national defense, social security, and other federal programs, but only if recipients of such programs are willing and able to pay for them. He favored capitalism, entrepreneurship, and independent business, stating that musicians could make more from owning their own businesses than from collecting royalties. He opposed communism, stating, "A system that doesn't allow ownership ... has—to put it mildly—a fatal design flaw." He had always encouraged his fans to register to vote on album covers, and throughout 1988 he had registration booths at his concerts. He even considered running for president of the United States as an independent.Zappa was an atheist. He recalled his parents being "pretty religious" and trying to make him go to Catholic school despite his resentment. He felt disgust towards organized religion (Christianity in particular) because he believed that it promoted ignorance and anti-intellectualism. Some of his songs, concert performances, interviews and public debates in the 1980s criticized and derided Republicans and their policies, President Ronald Reagan, the Strategic Defense Initiative (SDI), televangelism, and the Christian Right, and warned that the United States government was in danger of becoming a "fascist theocracy".In early 1990, Zappa visited Czechoslovakia at the request of President Václav Havel. Havel designated him as Czechoslovakia's "Special Ambassador to the West on Trade, Culture and Tourism". Havel was a lifelong fan of Zappa, who had great influence in the avant-garde and underground scene in Central Europe in the 1970s and 1980s (a Czech rock group that was imprisoned in 1976 took its name from Zappa's 1968 song "Plastic People"). Under pressure from Secretary of State James Baker, Zappa's posting was withdrawn. Havel made Zappa an unofficial cultural attaché instead. Zappa planned to develop an international consulting enterprise to facilitate trade between the former Eastern Bloc and Western businesses.
From what song, did a Czech rock group take its name?