This basically gives last breath assault track.
(You need to drag it into mod overides and also then enable it in music)
You don't need customost or any of that for this to work just SuperBLT and Beardlib.
If you have some audio files (mp3 or ogg format) and also want it setup a certain way, ask in comments and I will see what I can do.

If you wanna create your own you can use this for reference:

https://luffyyy.gitbook.io/beardlib/modules/heistmusicmodule
https://modworkshop.net/mod/21651
https://www.youtube.com/watch?v=NE71fAApamg

Credits:
(I in theory used these sources but accidently deleted the list of sources so some of these sources may not be used - better to credit more sources then risk not crediting sources that should get it)

https://www.youtube.com/watch?v=JgPI4kKzAsY

Undertale

Toby Fox

Temmie Chang

https://modworkshop.net/mod/41152

https://modworkshop.net/mod/30230

https://gamejolt.com/games/ULB/424292

https://soundcloud.com/benlabthesecond/cock-cock-cock-remastered

https://youtu.be/ox3i0WvgAQo

BenLab