Decided to give Custom OST a try, had fun doing so.
This mod adds songs from the soundtrack of the 1993 SNES title Plok - for your heisting experience.
Brought to you by Tim and Geoff Follin.

The contents of each phase:

• Stealth - Cavern

• Control - Boss (loop of 0:04 to 0:21)

  Alternative control - Flea Pit

• Anticipation - Boss (loop of 0:21 to 0:27)

• Assault - Boss (0:27 and so on)

Requires SuperBLT and Custom OST. Refer to the instructions.
If faced with issues, do let me know. Had tested it two times, everything seemed normal for me; but I'm not sure what's it going to be like for the end user. If the stealth track happens to be too short, I could extend it - albeit for the increased file size.
Also "why two different versions" you may ask. Well, I saw how it would've been if I used the "alt_" function of Custom OST, and I didn't like how the phases transitioned like. It's down to your personal preference if you would like to add both folders or not.
With that out of the way, I hope you enjoy!