.@soft-galaxies: this is really interesting to think about like... one of their four brain lobes focuses on music as a separate component from regular conversational/non-musical noises (i imagine there's something you could do w/ their brains vs how they can survive in non-ferenginar environments with so much auditory stimulus, also quark is canonically just a loud person so he's obviously not modulating himself, generally his whole family is loud besides rom i guess)
Brilliant headcanon about Ferengi using a separate auditory process for music.
like you'd imagine a people who are canonically sensitive to noises and sounds most other humanoids can't hear would be softspoken but they seem to be loud as a rule, and tv handwavey they don't speak any more quietly than other humanoids they encounter... they can prob hear music at levels non-ferengi can't hear but might also just be able to tolerate it at regular non-ferengi levels (e.g. nog listening to klingon opera) without pain, so low volumes might not be a thing
The handwaveyness of the show can be so frustrating! Quark is canonically capable of hearing Odo sloshing around upstairs, but he works in an extremely noisy environment with no apparent ill effects. Ah well. I do have a few possibilities in mind:
1) auditory desensitization as an evolutionary adaptation, selectively bred into well-to-do families whose children were expected to do interstellar business (not that plausible and rather boring);
2) hearing dampeners, perhaps integrated into the universal translator (more plausible, but still boring)
3) selective hearing loss after a certain decibel level has been reached - in essence, Ferengi having the opposite hearing range of a human. The quieter an environment, the clearer it would sound to a Ferengi; louder than 65 db or so, certain auditory receptors might shut themselves down defensively. (my personal favorite)
ALSO, all Ferengi are synesthetes to some degree or other and nobody can convince me otherwise.
as for genres, completely unrelated to xenobiology headcanons, i tend to associate more overproduced pop/hip-hop/r&b with quark (things for dancing, movement, grinding... versatile songs), rom with acoustic n gentle genres, nog with experimental ambient, electronica instrumentals (supported by that one ds9 books excerpt about nog enjoying atonal stuff)... i'd imagine there's a vast amount of stuff b/c competition in a capitalist industry etc.
I also imagine that certain individuals (coughBruntcough) would be uncomfortably into ASMR.