So in many songs I hear there is this really weird and eerie effect, and you can't tell if the person is singing high or not. Usually the music that accompanies it is pretty raucous and that is why it's so hard to tell. I infer that they recorded two tracks or more, in both regular voice and falsetto, but is there anything else to it? and while we are at it, how does one indeed go about recording multiple vocal tracks?
examples: