Q:What is required for this modification?
A:You first of all need BLT + BeardLib + BeardLib Music Module Addon.

Q:What soundtracks include in this mod?
A:Undertale - CORE (Genocide) and UnderTale - Core (17kj)

Q:How to instal?
A:Then insert the "(BLTh)Undertale Core" folder in your "PAYDAY 2/assets/mod_overrides/" and you're done

"Old version"