Crystalline

The first single from Bjork's seventh album, Biophilia, is an electronic song in which the Icelandic singer compares the process of crystal formation with her own personal growth over a trickle of triangle chimes before concluding with a raucous drum n bass section. It was released as a single on June 30, 2011 accompanied by an iPad app developed exclusively for the tune, which enables the user to build their own song structure as they tap through multi-colored tunnels.

Biophilia is a collaboration with Apple and is billed as the world's first "app album." It features music videos and unique apps for all ten tracks created to add multiple dimensions to each song.

In the app for this song, players can navigate through neon-colored tunnels and collect different crystals that change the musical structure of the song mix. "I didn't want the connection between the song and the app to be superficial," Björk told Billboard magazine. "It had to go to the core."