As an audio director (FarCry 3, 4, and 5), I can tell you that music plays a huge part in the total design of the soundtrack. You painstakingly give the game an overall mix and feel, setting levels on the foley, dialogue, sfx, ambiance, and music, then we give the player the control to shut it off!

Funny, I picked that piece of music. It's both the most hated and the most loved mission. I figure good players did the mission in one runthrough and enjoyed it. Bad players ( like myself) ended up hating it as they had to play that mission over and over.