Nearly all records have a lock-groove: it is the silent loop at the end of the side, which keeps the needle and tonearm from drifting into the label area. However, it is possible to record sound in this groove, and many artists have included looping audio in the locked groove. Probably the first track to utilize this technique was The Beatles' Sgt. Pepper's Lonely Hearts Club Band (1967), featuring a multi-layered collage of randomized chatter in its run-off loop.
Another example of locked groove record is Godspeed You! Black Emperor’s debut album F#A#∞ (pronounced F-sharp, A-sharp, Infinity). At the end of the song “Bleak, Uncertain, Beautiful…” there is a string phrase recorded on the locked groove.
1. Conrad Marca-Relli, painitng circa 1940's.
Throughout his career, Marca-Relli created monumental-scale collages. He combined oil painting and collage, employing intense colors, broken surfaces and expressionistic spattering. He also experimented with metal and vinyl materials. Over the years the collages developed an abstract simplicity, evidenced by black or somber colors and rectangular shapes isolated against a neutral backdrop.
2. Cover of Godspeed You Black Emperor, F-sharp, A-sharp, Infinity
The title of the album is pronounced "F-sharp, A-sharp, Infinity". This is a reference to the keys in which each side of the record begins and to the endless loop at the end. The compact disc version does not contain the loop.