Given the task definition, example input & output, solve the new input case.
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.
Example: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Output: Who believes Fagin's gang make wallets and handkerchiefs?.
This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.

New input case for you: Passage: Starting with the album Blood Fire Death, one of the first definitive Viking metal releases, Bathory incorporated a diverse range of musical elements. While retaining the noise and chaos of previous recordings, the band took a more sorrowful and melodic approach, working in ballads based on Germanic and Norse folklore, shanty-like melodies and folk music elements such as bourdon sounds, Jew's harps, and fifes. Bathory added natural found sounds, such as ocean waves, thunder, and wild animal noises, in a style similar to that of musique concrète. Instruments were sometimes used to create onomatopoeic effects such as drum sounds imitating thunder or a sledgehammer. The songs typically featured multi-sectional formal structures, following a pattern of three instrumental sections – introduction, bridge, and finale – and two vocal sections – stanza and refrain.Enslaved, a formative band in Viking metal, performs primarily a black metal style, but has over time become more progressive. Eduardo Rivadavia described the hallmarks of Enslaved as "Viking themes, razor sharp guitars, blastbeat drums, and an ear for orchestration resulting in complex structures, bountiful harmonies and time changes." However, the band has evolved significantly with every album since Mardraum – Beyond the Within (2000) onward.The Faroese band Týr has a standard rock band lineup with electric instruments, but makes extensive use of traditional Faroese music in its songs. Faroese ballads typically involve unusual time signatures, most commonly 74 or the alternative rhythms 128 or 98. In an attempt to replicate these uneven signatures, Týr often places the accent on the weak beat of the bar. In songs based on old Faroese ballads, Týr usually play in harmonic or melodic minor scale or else in mixolydian mode.
Output:
What was the pattern of the three instrumental sections the songs followed?