I didn't find her "After You've Gone" clip. Instead, found this:

"The most ethnic, and paradoxically enough the most international singer we have in Norway is Mari Boine. She is a Sami and incorporates more modern pop expressions into her traditional "joik" ­ a type of yodelling which consists of rythmic sung poems or poetic songs. She has been invited to perform at a number of festivals of ethnic music through-out the world and has created her own special musical expression."
(From Norwegian pop music)

~Masato