The Prodigy's fourth studio album, Always Outnumbered, Never Outgunned, was released on 23 August 2004, and 14 September 2004 in the USA. A precursory and experimental single, "Memphis Bells", was released in very limited numbers, followed by the traditional release of the single "Girls". The U.S. version of the studio album contained a bonus track; a remix of "Girls", entitled "More Girls". The album, which topped the UK Album Charts on its debut week, was promoted by a 2-year-long tour.
5,000 digital copies of "Memphis Bells" were sold over the Internet. Each copy was a combination of customer-chosen instrumental, rhythmic, and melodic options, of which 39,600 choices were available. Five mixes were sold in three file formats, WAV, two audio mixes in MP3, and a 5.1 DTS surround sound mix, and all were free of digital rights management.
In 2005, they released a compilation, Their Law: The Singles 1990-2005, which spawned a single containing new remixes of the songs "Out of Space" (the "Audio Bullys Remix") and "Voodoo People" (the "Pendulum Remix"). The artwork represented drawn versions of the front covers of the "Out of Space" and "Voodoo People" single releases. The latter wa…