It's all royalty free music haha I have edited some tracks, adjusted tone and tempo, stuff like that.
You can read credits here: https://ghostwind.itch.io/unobelisk/devlog/155577/just-some-place-to-post-credit...
There's urls with the source of the music, though not 100% sure all the links still works.
There's a whole lot of incredible musicians out there with royalty free music available, wouldn't never guess how high quality they can be, before i needed them.