Installation :
1- Open Steam
2-Right Click On Payday 2
3- Then Go To Manage And Select ''Browse Local Files''
----Once You Have SuperBLT and Custom OST added to the mods folder----
4-Open The Mods Folder
5-Open CustomOSTTracks And Extract The RAR File in CustomOSTTracks File
And that'ts It , Just start a heist and select the song :D