The technique of splicing recorded magnetic tape head-to-tail into a closed circle so a phrase repeats without end · the founding repeating unit of musique concrète, carried into the genre this archive covers as drone-bed, rhythmic spine and compositional default.
The tape loop is a length of recorded magnetic tape spliced end to end into a physical circle, threaded around the heads of a reel-to-reel machine so that the recorded phrase plays back over and over with no break. It is the simplest of the tape techniques and one of the oldest: where the tape cut-up reassembles many fragments into a new whole, the loop takes a single phrase and holds it, letting repetition do the compositional work. The two techniques are not rivals; they are used side by side in the same studios, often within the same piece, and a great deal of the genre this archive documents is built from loops and cut-ups together.
The technique came out of the early studio practice of working directly with recorded tape rather than with notation. Pierre Schaeffer and the Groupe de Recherches Musicales in Paris had already established the closed groove (a locked circle cut into a disc) as a way of holding a sound for study; the closed tape loop is the same idea moved onto magnetic tape, where it is far easier to make and to alter. The loop and the closed groove are the two founding repeating units of musique concrète, and the loop is the one that travelled furthest, because any reel-to-reel machine could make one with a razor blade and a splicing block.
Through the 1960s the loop became the engine of two quite different musics. In minimalist composition, Terry Riley and Steve Reich used loops to build long, gradually shifting structures: Reich's It's Gonna Rain (1965) runs two copies of the same spoken loop on two machines whose speeds drift apart, so the phrase slowly moves out of phase with itself and generates patterns no one wrote. In rock, the same closed-circle method fed the studio experiments that ran from the mid-1960s onward. The loop's appeal in both cases is the same: it removes the performer's hand from the moment-to-moment and lets the material reveal what it contains under repetition.
The genre this archive covers inherited the loop as a compositional default. Throbbing Gristle built loops as drone-beds and rhythmic spines beneath the noise, the looped phrase giving a piece its floor while the live electronics worked above it. SPK and the larger first wave used the loop the same way, as did the cassette-network underground of the early 1980s, where a four-track machine and a tape loop were often the whole of a project's means. The loop sits underneath a large part of the founding catalogue, frequently uncredited because it is so basic to the method that no one thought to name it.
The loop's relationship to drone and dark ambient is direct. A loop slowed, layered and processed becomes a sustained bed; Coil's later Musick to Play in the Dark material and the larger F·17 Dark ambient field rest on looped and treated material held under everything else. The loop is also the simplest route to the kind of repetition that the rhythmic-noise and industrial-percussion traditions build on, where a looped metallic hit becomes the pulse of a whole piece.
The loop's position in 2026 is healthy in a way the physical-tape cut-up's is not. The transition to digital editing absorbed the cut-up into the default toolkit and quietly retired the razor blade; the loop, by contrast, has both been absorbed (every digital workstation and every loop pedal is a looping machine) and kept alive in its physical form by a sizeable tape-loop revival scene that prizes the wow, flutter, dropout and slow degradation of real tape as part of the sound. The Bureau notes the revival without nostalgia: the degrading physical loop is a different instrument from the perfect digital one, and both are in use.
The Bureau holds the tape loop as one of the genre's two founding tape techniques, filed alongside the cut-up. The loop's musique-concrète origin sits upstream; the minimalist phase pieces sit adjacent as the technique's most-studied application; the industrial-music use across the founding catalogue is the documentation the file collects. The technique is alive in both its digital and its physical forms, and the file treats them as continuous rather than ranked.
Filed by Bureau editor · VAGO · c. the Bronze Age · last revised c. the postwar period