The 12 songs of Soul Suppresion(literal translation) Also, fyi, comments about the player's breast makes up almost half of the comment section
Considering that there is not even a glimpse of them, I guess that there are a lot of suppressed needs among the viewers.
here this might help found it on https://vocaloid.fandom.com/wiki/ think its the same song "十二镇魂歌" Traditional Chinese: 十二鎮魂歌 Pinyin: Shí'èr Zhènhúngē English: Twelve Requiem Official English: Revelation Twelve Town Soul Song
I am a guy and I have no idea what' s so interesting about her breast. But then again in country with little legal porn people do go crazy without outlet.
The instrument is relatively rare (at least in the west), so you may be confusing this specific song with something that sounds similar.
This is probably why cultivation novels be exaggerating them skins, robes, and ancient underwear. Weird... immortals. (Well, they're false immortals stealing from the boundless heaven and earth)