This time uploaded by the person who actually made the mod and not someone who uploaded without even asking for permission. includes a spanish translaiton as well.
lets you change what track is playing on only the original 6 heists. wolfpack heists and no mercy proved to either crash or make the game unstable, or buggy in some way.

Known bugs: dropping into a game and host has this mod and selects a track that isn't the default for that heist will make you hear what host has selected instead until the music state changes (99% certain this happens if you don't have the mod installed)