The Catalogue (German language edition: Der Katalog) is a boxed set comprising eight albums by Kraftwerk that were released from 1974 to 2003. All albums are digitally remastered, with most of the cover art redesigned, including rare photographs in the liner notes that were not part of each album's original release.
"We've been digitally transferring all of Kraftwerk's original recordings and sound sources from our badly degrading master tapes while our engineers, Fritz and Henning, have been working in parallel to remaster our early albums for re-release. So for the first time, our recordings will be available in crisp, clear Kling Klang sound with all the fold-out covers and images our label at the time either messed up or wouldn't pay for. There will be some alternate mixes of tracks and some unedited versions, but unfortunately we don't have much unreleased material. We never recorded extra songs or twenty different versions of the same song. We would complete a song and then move forward, always keeping very focused on one Kling Klang project at a time."
— Ralf Hütter, 2004
"The sound needed remastering… it’s like a reconstruction, like when a painter takes his paintings from the archives and blows the dust off and puts them in a retrospective. It was quite time-consuming work, but I think once you see it you will immediately understand. —Ralf Hütter"
Due to licensing issues, three of these albums—Computer World, Electric Cafe (now re-christened with its original working title of Techno Pop) and The Mix—are unavailable in the U.S. except as part of the boxed set (although they can now be purchased digitally via the iTunes Store). The Techno Pop album contains a slightly revised track listing from its predecessor Electric Cafe: the song "The Telephone Call" now appears in its much shorter single mix, and that single's b-side remix, "House Phone", has been added as a proper album track.