In 2013, he worked with the Scottish singer/songwriter KT Tunstall on her fifth studio album Invisible Empire // Crescent Moon.
She also revealed the album cover, in which she is seen from behind in the desert of Tucson, Arizona.
Teaming up with M. Ward and Steve Shelley from Sonic Youth band, Gelb brings eleven songs inspired by his native Arizona Desert, in which he recorded KT Tunstall's fith album Invisible Empire // Crescent Moon earlier in 2013.
Ottoman Empire | Order of the British Empire | Russian Empire | Moon | Roman Empire | British Empire | Holy Roman Empire | German Empire | Byzantine Empire | International Red Cross and Red Crescent Movement | Mughal Empire | Austrian Empire | First French Empire | Empire of Japan | Sailor Moon | Empire State Building | Vijayanagara Empire | moon | Spanish Empire | Boardwalk Empire | Empire | The Invisible Man | From the Earth to the Moon | Keith Moon | Mongol Empire | Ban Ki-moon | Second French Empire | Order of the Indian Empire | Titan (moon) | International Federation of Red Cross and Red Crescent Societies |
A music video was released on 29 April 2012 on Vevo, it was shot in the Sonoran Desert near Tucson, in which she recorded Invisible Empire // Crescent Moon.