Locked grooves are circular rather than spiral. If audio is recorded on a locked groove, it repeats every time the record turns. This record consists of 100 locked grooves containing samples contributed by various experimental and noise artists, including Amphibious Gestures, Cryptic Weavil, Insect Deli and Mister Fuckhead, among others. Samples like these are used by DJs in electronic dance music.

The spiral groove on virtually all records ends in a locked groove, or runout groove, close to the label to prevent the needle from riding up on the label. Normally that groove is silent, but recording in the locked groove started with John Cale in 1966. The Beatles famously recorded in the locked groove on Sgt. Pepper's Lonely Hearts Club Band.