There is sometimes a video, which is collecting visual fan-made content, they call it a "fair", and, after the developer company, it is named "Hoyofair".
Sometimes, there are quite impressive fan-made elements in these videos, good songs, like, for example, the Rap-Battle HiddenX linked to above.
In this video
View: https://www.youtube.com/watch?v=U2mci6a4Fyw
of the "Spring Fair 2023" there is quite a good song, for example, at timestamp 25:00, a very nice pop song, which you can listen to with eyes shut (if you don't like the graphics style) as well. The creator's name can be found at 28:29, but it looks as if it is written in Chinese letters, which makes it difficult to read for me. After that timestamp, there seems to appear a "part 2" of that song, or a coda. The whole song seems to be called "Welcome", which is confirmed by the end cridits of the voideo at the very end (see below).
At timestamp 34:54, there is another nice song, called "Windblume spent together", which relates to the in-game "Windblume Festival" (Blume[German] = flower [English], which is about friends spending time together.
Timetamp 42:00 also has a nice song, which is called "Orange Ètude", which apparingly is about a school band.
Timestamp 59:20 has a highly satirical song called "The Diagnosis".
At timestamp 1:46:40 there is a very beautiful song called "A realm of dreams unforgotten", which plays with the main stories of the game, and of figures lose and won.
And finally, timestamp 1:49:41 shows the "end credits", who did which song.
All in all, I must say that I'm quite astonished about how much time young people dedicate to creating this kind of content.
I think I lived under a rock for a while.