Music is an extension of emotion, or evocative there of. I notice that a lot of closed captioning for the hearing impaired does this when a movie score is being described, it will use a word evocative of emotion like “cheerful” or “intense” to precede the word music in the captions. With or without the dimension of sound, emotion is always at play in the human equation so it may be best not to overcomplicate the description and leave it to something universally relatable. Even with modular, words like frenzied or driving, rhythmic or haphazard, could all (at times) be apt descriptions.
Just my thoughts though, so not necessarily the only way to interpret the task. Interesting, at least for me it is, to think about how to approach this type of topic.
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