Inuit throat singing, or “katajjaq” is a form of musical performance uniquely found among the Inuit. Through a specialized vocalization technique a throat singer can produce two or more notes simultaneously. Details on this can be found at the Folkways website.
This cultural activity was almost extinguished before Inuit elders began to encourage the younger generation to learn it. A great video about this history of the vocal style and the technique used to produce the sound can be found here:
One of the most famous and remarkable throat singers is named Tanya Tagaq. Check out a really cool video with her here: