First of all, I have never played vanilla since it gets frozen at the splash screen without a mod so I don't know if this music is vanilla, but the mod has its own music file.
The in-battle music track where there's this really epic women's choir has an awful after effect. When the singer's die down into the drum/base background music there is a high pitched noise so unpleasant that I have to mute the music. Since the women's choir part seems to be prompted by combat, this high pitched noise usually starts about 10-15 min into every battle.
I'm 20, so there might be an age limit on who can here it.