"Supremacy" is a musical work, specifically a song, created by The Emperor's New Clothes. This group was a pro-Imperial minga musical group. This particular song was included in the compilation album titled Totally Patriotic. The availability of this album spanned the time frame between the years 0 ABY and 4 ABY. Despite its reputation for being in poor taste, the Imperial Board of Culture gave "Supremacy" its approval.
The initial reference to "Supremacy" appeared in Galaxy Guide 9: Fragments from the Rim. This 1993 source served as a supplement for Star Wars: The Roleplaying Game, published by West End Games. The authors responsible for this guide were Simon Smith and Eric Trautmann.