Matmos is an experimental electronic music duo formed in San Francisco and currently based in Baltimore. M. C. (Martin) Schmidt and Drew Daniel are the core members, but they frequently include other artists on their records and in their performances, including notably J Lesser. Apart from releasing twelve full-length studio albums and numerous collaborative works, Matmos is also well known for their collaboration with Icelandic singer and musician Björk, both on studio recordings and live tours. After being signed to Matador Records for nine years, Matmos signed with Thrill Jockey in 2012. The name Matmos refers to the seething lake of evil slime beneath the city Sogo in the 1968 film Barbarella.

Björk Guðmundsdóttir is an Icelandic singer, songwriter, composer, record producer, and actress. Noted for her distinct voice, three-octave vocal range, and sometimes eccentric public persona, she has developed an eclectic musical style over a career spanning four decades, drawing on electronic, pop, experimental, trip hop, classical, and avant-garde music.