I've tried in the Sandbox.. but it's difficult
(Sandbox answer was removed, see final version below.. )
Main takeway from the comments: like story-building has no role on WB, the gamer plays no role on WB
Anything that emits from the loudspeaker is only audible to a game player, not in your world. On WB, it is not appropriate to start about your latest game-music, proposing a soundtrack for a game or something. It will be rejected, because the music is not actually inside the world that you build. The music happens in the real world, on a player's PC. So it is not relevant.
That's why after 2 attempts involving game music, I had to invent a snail emitting a minor chord. The snail is in the forest, the music is part of my creature design.
Some variations on my snails question were put
Tortliena: " I'm making a game where there are lots of snail people. I would like some instruments to play in the game at the same time snailmen play. However, I'm stuck on the kind of instruments to give. The scene they play is for some chamanic rituals, so it's bound to be something more akin to magic, they live in medieval times and have large access to... Let's say shells. So goal is "magical" instruments made of shells. what kind of instruments would they make?"
JBHCodidact: My giant snails have the following esophageal configuration, what sounds could they be expected to make?
My two cents: I think it will not work because music is always plausible
imho, culture is vulnerable for vtc anyway, on WB. Opinion-based, almost by definition. There preferably should be one answer, for one question. Culture does not allow that often. There is affiliation with physics here, Q&A is regarded as problem-solving. Music does not really fit that format.
I feel the thing we almost always try to accomplish on WB is a plausibility-check: this forum loves "would XYZ be credible" questions, which are then answered with science-based observations about astrophysics, climate, biology, sociology, psychology.. When a question does not ask for something very specific and well-defined, it is often considered as unclear, or fishing for ideas.
Note 10-3: thanks again @sphennings for all the feedback. As the Sandbox is no place for persistent submits, I'll put the definite version here,