Somehow, I ended up on the Wikipedia article on yodeling. It claims that there are different varieties of yodeling in different cultures. It continues, "[i]n Georgian traditional music, yodelling [sic?] takes the form of krimanchuli technique, and is used as a top part in three/four part polyphony."
This sounded intriguing, so I searched Youtube for "krimanchuli" to hear some of this Georgian polyphonic yodeling. I clicked on the first video, called "Orera 'Krimanchuli,'" and it blew my mind. Six Georgian guys in skinny ties singing the most intricate contrapuntal melodies. At first it is just amazing. Then around 1:30, it takes off in a new and exciting direction, as they add drums, piano, and bass. They alternate between Lambert, Hendricks, and Ross-esque vocalese solos, and harmonies tighter than the treads on a T-72 tank. The yodeling comes in at around 3:14, which will only impress you further. I'm at a loss for words, just watch it yourself.
Sidenote: There are bands today that dress like this, except they are doing it ironically. Of course, irony was outlawed in the Soviet Union, so we can only assume they are very serious.