Who Is It (Björk song)

"Who Is It" (sometimes "Who Is It (Carry My Joy on the Left, Carry My Pain on the Right)") is a song recorded by Icelandic singer Björk for her fifth studio album Medúlla. It was released as the lead single from the album on 18 October 2004 by One Little Indian Records. Björk wrote "Who Is It" during the recording sessions for her previous album, Vespertine (2001), when it was known as "Embrace Fortress"; she left it off the album it as she felt it came from "a different family". The final version features throat singer Tanya Tagaq and beatboxer Rahzel, and lyrics reflecting the dialogue between mother and child.

Critics praised "Who Is It" as exuberant and catchy. It peaked in the top five on the single charts in Spain and reached the top 30 in Italy and the United Kingdom. The music video was directed by Dawn Shadforth and shot outdoors in Iceland, and features Björk in a bell-shaped dress designed by Alexander McQueen. During the promotional campaign for Medúlla, Björk performed the song on a number of occasions, such as Friday Night with Jonathan Ross and L'Album de la semaine. She performed it on subsequent tours. It has been covered by Bon Iver and Kurt Elling.