Fusing low-res electronic noise and pop hooks so effortlessly that it can seem accidental, Crystal Castles began as producer/multi-instrumentalist Ethan Kath's solo project in late 2003. Kath got the moniker from the name of She-Ra's dwelling in the -He-Man and -Masters of the Universe cartoon series; it's also the name of a 1983 !Atari video game, which is oddly appropriate, considering that one component of the band's distinctive sound comes from a keyboard modified with an !Atari 5200 sound chip.
When Kath collaborated with singer Alice Glass on some songs in spring 2005, Crystal Castles' lineup was complete. One of the songs the pair recorded, "Alice Practice," was something of an accident: it was intended to be a demo of Glass testing out a microphone, but its presence on MySpace piqued record labels' interest. "Alice Practice" was released as a limited-edition 7" in summer 2006 on Merok Records, also home to Klaxons; its 500-copy run sold out in three days. The duo worked on their own songs and also honed their remixing skills, tweaking songs for Klaxons as well as GoodBooks, Uffie, Health, and Bloc Party. Tours with the Presets and Metric in 2007 set the stage for the release of Crystal Castles' self-titled debut album, which Last Gang released early in 2008.