Problem: Background: Zhang Heng (Chinese: Zhang Heng ; AD 78-139), formerly romanized as Chang Heng, was a Han Chinese polymath from Nanyang who lived during the Han dynasty. Educated in the capital cities of Luoyang and Chang'an, he achieved success as an astronomer, mathematician, scientist, engineer, inventor, geographer, cartographer, artist, poet, statesman, and literary scholar. Zhang Heng began his career as a minor civil servant in Nanyang. Eventually, he became Chief Astronomer, Prefect of the Majors for Official Carriages, and then Palace Attendant at the imperial court.
Context: Zhang Heng is often credited with inventing the first odometer, an achievement also attributed to Archimedes (c. 287-212 BC) and Heron of Alexandria (fl. AD 10-70). Similar devices were used by the Roman and Han-Chinese empires at about the same period. By the 3rd century, the Chinese had termed the device the ji li gu che, or "li-recording drum carriage" (the modern measurement of li = 500 m/1640 ft).  Ancient Chinese texts describe the mechanical carriage's functions; after one li was traversed, a mechanically driven wooden figure struck a drum, and after ten li had been covered, another wooden figure struck a gong or a bell with its mechanically operated arm. However, there is evidence to suggest that the invention of the odometer was a gradual process in Han Dynasty China that centered on the "huang men"--court people (i.e. eunuchs, palace officials, attendants and familiars, actors, acrobats, etc.) who followed the musical procession of the royal "drum-chariot". There is speculation that at some time during the 1st century BC the beating of drums and gongs was mechanically driven by the rotation of the road wheels. This might have actually been the design of Luoxia Hong (c. 110 BC), yet by at least 125 the mechanical odometer carriage was already known, as it was depicted in a mural of the Xiao Tang Shan Tomb.  The south-pointing chariot was another mechanical device credited to Zhang Heng. It was a non-magnetic compass vehicle in the form of a two-wheeled chariot. Differential gears driven by the chariot's wheels allowed a wooden figurine (in the shape of a Chinese state minister) to constantly point to the south, hence its name. The Song Shu (c. AD 500 ) records that Zhang Heng re-invented it from a model used in the Zhou Dynasty era, but the violent collapse of the Han Dynasty unfortunately did not allow it to be preserved. Whether Zhang Heng invented it or not, Ma Jun (200-265) succeeded in creating the chariot in the following century.
Question: What is the south-point chariot?
Answer: The south-pointing chariot was another mechanical device credited to Zhang Heng.

Problem: Background: A Night at the Opera is the fourth studio album by the British rock band Queen, released on 21 November 1975 by EMI Records in the United Kingdom and by Elektra Records in the United States. Produced by Roy Thomas Baker and Queen, it was the most expensive album ever recorded at the time of its release. The album takes its name from the Marx Brothers film of the same name, which the band watched one night at the studio complex when recording. A Night at the Opera incorporates a wide range of styles, including ballads, songs in a music hall style, hard rock tracks and progressive rock influences.
Context: "Bohemian Rhapsody" was written by Mercury with the first guitar solo composed by May. All piano, bass and drum parts, as well as the vocal arrangements, were thought up by Mercury on a daily basis and written down "in blocks" (using note names instead of sheets) on a phonebook. The other members recorded their respective instruments with no concept of how their tracks would be utilised in the final mix. The famous operatic section was originally intended to be only a short interlude of "Galileos" that connected the ballad and hard rock portions of the song.  The interlude is full of "obscure classical characters: Scaramouche, a clown from the commedia dell'arte; astronomer Galileo; Figaro, the principal character in Beaumarchais' The Barber of Seville and The Marriage of Figaro...Beelzebub; identified in the Christian New Testament as Satan, Prince of Demons, but in Arabic as "Lord of the Flies". Also in Arabic the word Bismillah', which is a noun from a phrase in the Qur'an; "Bismi-llahi r-rahmani r-rahiim", meaning "In the name of God, most gracious, most merciful".  During the recording, the song became affectionately known as "Fred's Thing" to the band, and the title only emerged during the final sessions.  Despite being twice as long as the average single in 1975 and garnering mixed critical reviews initially, the song became immensely popular, topping charts worldwide (where it remained for an unprecedented nine weeks in the UK) and is widely regarded as one of the most significant rock songs in history.  After Freddie Mercury's death, the song was rereleased as a double A-side to "These Are The Days Of Our Lives" on 9 December 1991 in the UK and September 5, 1991, in US.
Question: Was there a particular method Mercury used to write the song?
Answer:
All piano, bass and drum parts, as well as the vocal arrangements, were thought up by Mercury on a daily basis and written down "in blocks" (