stick the folder from the RAR into your mod_overrides folder

This Mod Replaces The Loot And Objective Sounds With "Hey Guys, The Funfair's In Town"
as shown in this video 
https://www.youtube.com/watch?v=Ty6pN9P7KsM

Subscribe to groundbreaking - https://www.youtube.com/user/GroundbreakingBand