Inuit throat singing, or katajjaq, is a form of musical performance uniquely found among the Inuit. (An analogous form called rekuhkara was once practiced among the Ainu of Hokkaidō, Japan.) The Inuit performers are usually women who sing only duets in a kind of entertaining contest to see who can outlast the other. However, at least one notable performer, Tanya Tagaq, performs throat singing as a solo artist and as a collaborator with non-throat singing musicians such as Icelandic singer-songwriter Björk. The musical duo Tudjaat performed a mixture of traditional throat singing and pop music.