System 7 are a British ambient dance band. Due to the existence of another band called System Seven they were initially billed as 777 in North America. System 7 was the name of the current Macintosh Operating System at the time of the band's formation.
Steve Hillage and Miquette Giraudy, both formerly of Gong, formed System 7 after hearing the likes of the Orb playing Hillage's 1979 ambient record Rainbow Dome Musick. They soon became part of the underground dance scene in London. While Hillage and Giraudy form the core of System 7, it is more of an extended collaborative project with artists such as Carl Craig, Laurent Garnier, Derrick May, Alex Paterson (of The Orb), and Youth. System 7 makes extensive use of Hillage's guitars.
Hillage and Giraudy later launched a spin-off project called Mirror System, and have also worked under the name Groovy Intent.