Always wanted to see this in game but never could get correct looping working until now since we have custom tracks. It's incredibly easier to do them now.
I found it on The Cutting Room Floor.
Preview: https://tcrf.net/images/c/cb/Payday_unused_song.ogg
Named ingame as "Unknown PDTH Track".
Anticipation might be a little rough but I think overall the whole thing is good to use.