Tom tunes into the background, exploring what background music really is; telling the surprising story of the Muzak corporation, and discovering that there's a range of background functions that music can have: from the 'furniture music' of Erik Satie to the Stimulus Progression albums used in Lyndon B Johnson's White House. Daniel Barenboim, Julian Lloyd-Webber and Brian Eno help explain the power of and problems with background music.