Some various soundtracks from the game nuclear throne which I have setup into heist song thingy.
(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:

https://www.youtube.com/watch?v=LjmTwnoL2EY - Setup/Stealth

https://www.youtube.com/watch?v=FXB3f5RKV1A - Buildup (Stealth failed - intro to loud)

https://www.youtube.com/watch?v=p5jd6u_23GQ - Anticipation (Between assault waves)

https://www.youtube.com/watch?v=gRinrFL_BbU Assault (Loud)