From what little I found, I am guessing it must have been Inuit......

"Throat singing is a well-known form of Inuit music that is usually performed by two women. The singers stand face to face; it helps if one singer is taller than the other. Each singer repeats a different sound in a fast rhythm. The low-pitched sound that is the trademark of throat singing represents sounds made by different birds and animals. Sometimes, throat singing can be a contest to see who can sing the longest. Some women are able to throat sing by themselves, using a large bowl or kettle held near the singer's mouth to give resonance. This method is common in the Arviat area.

If you would like to try throat singing, here are the basics. Try to make a sound deep in your throat without making noise from your mouth. Make the sound as you exhale, then inhale quickly without making a sound. Repeat this, remembering to make sounds only when you exhale. The sounds can be long or short.

From: http://www.arctictravel.com/chapters/inmusicpage.html