Modified version of Zapzop addon (Yes, I know, the mod of the mod of the mod).
But... what's the difference?
All ambience/horror themed tracks, and some versions of repeated ones but with different artists, have been replaced by DUSK metal-esque tracks made by Andrew Hulshult, and others tracks from the apparently abandoned BD wad BYHAE by elguitarTom.
Why? Because this mod is designed to synchronize with the fast paced action of the latest versions of Project Brutality.
Some orchestra w/guitars tracks for bosses have not been replaced (Also is recommended to play this with Final Icon of Sin by Mark, with the boss action soundtrack deleted for a better music match)