This is the very ancient ( not pre human but post human ancient to their culture) Callie (right) and her cousin Marie (left) preformed this song at a youth contest(?) during a festival (or some similar festival) they were the youngest to preform i believe. And them preforming this song is what brought them and sky rocketed their idol career as the "Squid Sisters". The song is believed to have some kind of energy/spiritual energy and well...that's for you to learn if there is any truth to it. Remember, they both gaind there humanoid forms earlier then average.
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Also ALL MUSIC is in universe. If your hearing music, it is happening in universe. All music has in universe bands. They have their own covers and character designs, we even meet a couple, like Harmony and acht (shes a dj and we get all her music in splatoon 2 dlc)
Here is one of them. One of my favorites.
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Splatoon music is its own genre that takes different genres and experiments. Each main idol group represents a culture from the world.
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Here is from splatoon 3 dlc (side order). I really like this one too.
Splatoon 2 finel fest was choas vs order. Order (marina) lost. So the main game was "choas" and the dlc was about "order"
The music is a collaboration with acht and off the hook (marina and pearl)
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Fun fact, in a good amount of youtube videos. I can hear people use splatoon music as background music.