In 1998, Matmos remixed the Björk single Alarm Call. Subsequently, Matmos worked with Björk on her albums "Vespertine" (2001) and "Medúlla" (2004), as well as her "Vespertine" and "Greatest Hits" tours. In November 2004, Matmos spent 97 hours in the Yerba Buena Center for the Arts as "artists in residence," performing music with friends, musical guests and onlookers. The live album "Work, Work, Work", essentially a "best of" collection of the session, was released as a free download from their website.