Extract from "Tones, Moans and Shouts: The Voice in Tamriel"

…the origin of Orsimeri Koguz is just as interesting and strange as the Orsimer themselves. Koguz is the act of singing in which the singer manipulates the resonances created as air travels from the lungs, past the vocal folds, and out of the lips to produce a melody. The lower incisors and thick lips of the Orcs helps produce a distinct sound.

Koguz has its origins in Ancient Dwemereth, where Dwemer craftsmen would sing to their creations as part of the building process. Though we know they created it, we do not know the actual term for Koguz as the Dwemer called it. The Dunmer Ashlander people call it Cithunif Yivohn, possibly stemming from the unknown Dwemeri term for Koguz itself. It is clear to see how Koguz came to be known among the Orsimer, as the Dwemer had established civilizations all through Tamriel and it would take just one willing master and student to spread it among the Orsimer people.

To the common observer, Koguz seems to behave like a ritual magic. However it shares more in common with the Shouting of Skyrim, Wind Whistling of the Maormer and the Yodelling of the Bretons. A common Orsimer myth on the power of Koguz tells of two Orcs having a scrap when one gets punched in the throat. He inadvertently lets out a yell in Koguz and destroys half his stronghold in the process. Korguz can be used to heal, enhance combat prowess and even ease travel (See: Rag and the Seven City Step). However it’s most often used as bait during a hunt, as a skilled Orsimer Huntsman can use it to imitate the mating call of the animal the party is hunting.

Maormer Wind Whistling is an entirely different…