This is one of the many append discs that was released for Konami's long-running rhythm game series. Club Mix includes all of the songs from the arcade release of the same title, many of which are popular club tracks licensed from Sony Music. Also included on the disc are a number of extra tracks originally featured in the arcade version Complete Mix 2, as well as a handful of tracks originally featured in Gottamix 2.
As this is an append disc, this game requires the the original beatmania or one of the later "key disc" releases in order to be played. It was the last such append disc that Konami released.