“Melon: Remixes for Propaganda” is a compilation of remixes released originally exclusively to members of the band’s magazine/fan club, Propaganda, in spring 1995. Some of the remixes have been re-released on later singles and compilations, while some remain exclusive to this set.
For more information see e.g. wiki
The idea behind the album began when U2 lead singer Bono complained how people do not dance to U2 music.