I made this for a mod I may not ever finish, so I'm releasing it here.
This was made using LMMS with the soundfont "FluidR3_gm".
Before making this I did a quick analysis of Minecraft music and noticed a few things I summarized with 4 points:
1 - every song fades in at the start and out at the end
2 - there's often a very slim range of instruments
3 - there's a simple repeating melody with more getting added as it goes on
4 - the loudest part is a bit after halfway through
I then noticed something - "An Absence" from the Ultrakill OST would be easy to remake to fit these 4 points. And so I cooked up a little cover, added the fade-in and fade-out in Audacity, and decided to upload it. I then built the room in the pic using some blocks from the mod.