They are known for their melancholic lo-fi sound and their explosive live shows.
They are named after the lyrics "The fate of the world is safe in Crystal Castles" and "Crystal Castles, the source of all power" both from the theme song for She-Ra's fortress.
Crystal Castles used Trevor Brown's artwork (depicting a black-eyed Madonna) without permission.
- In one of Kath's earliest, unreleased demos, he incorporated a sample without permission.
Crystal Castles are known not only for their own efforts as a band, but also for commissioned remixes for number of groups, including Hunting For Witches by Bloc Party, and Atlantis to Interzone by friends and label mates, Klaxons.
In mid-2008, Crystal Castles were involved in two controversies related to artwork permissions and samples in their earliest unreleased songs.