My favorite present over the holidays is when my mom brought her singing parter, Rob, and his friend, JI, to our house to teach herself, me, and my sister how to do harmonic singing. It's like magic, really! My sister, in particular, has become totally obsessed with it. Look at this performer/vocalist, Natascha Nikeprelevic … She is actually creating those harmonic (all those higher octaves and 5ths with her voice) naturally. This is producing this sound. This is for real. When I practice this, I am starting to be able to hear one octave and occasionally a 5th and very very quietly, but not like this woman. No way! I'm dumbfounded she can do this. I just think this is so beautiful what she is doing, what we can do with our own bodies. 

http://www.youtube.com/watch?v=p1T3QArgcLk&feature=youtu.be