Ancestors is a duet between Tanya Tagaq Gillis and Björk. The song compromises of only whispers, moans, and throat music, with no actual lyrics and the backing of a piano. Even though praised for its risk, many times Ancestors was dubbed as the unbearable track of Medulla, yet the most experimental.. Most critics though did praise the song for its risk while also giving the album strong reviews. Many have stated that its her riskiest song in her entire career.
The song also appears on Tagaq's 2005 album Sinaa.