The Grand Cathedral BGM, aka, Corridor of Death, is THE Serious Sam music track to jam out to while heisting.
I was inspired by Matthelezor's Serious Sam Character pack to add this, since I was disappointed that Corridor of Death was used as anticipation music, not assault music.

Actually, speaking of Matt, I used his Enlightening the World (from the Serious Sam character pack) for the base of this music mod:

The only differences between that music track and this one are:

Original Version:
The Control (between assaults) music plays the peaceful version of Tunguska, from Serious Sam 4.
The anticipation is now ... whatever that "Mid" track is from Matt's Enlightening the World.
The first assault loop will play the original Grand Cathedral, from The Second Encounter.
The second assault loop has a 50% chance of playing the Serious Sam 4 version of Grand Cathedral.

Cover Version

The tracks are mostly the same as the original versions, but with some slight changes:

Control: Maciej Dąbrowski
https://www.youtube.com/watch?v=bRpEOrItLvE

Assault (1): Saferty
https://www.youtube.com/watch?v=aWrCF_j2lLU

Assault (2): Ludex
https://www.youtube.com/watch?v=bx8rAtiKZF0