I should clarify that this only replaces the songs for the Scarface Mansion and Murky Station's radio (and maybe some other heist I didn't check).

There are 6 tracks to replace, both the Yakuza and MGR version have their own 6 songs which you can check in this playlist.

If you wish to use just one of them, then simply put one of the folders in your mod_overrides and you're set.
If you wish to mix them together, I also uploaded a text file that tells you which number is which song so you may replace the files without confusion.

It ain't much, but it's honest work. Sometimes you just get bored of the usual same songs playing on the radio, y'know?