Musique concrete or concrete music refers to sounds (objects, discrete sounds) derived from the world and from synthesis brought together into a collage or sound sculpture as a structure to be experienced through listening.
The theoretical basis of the style was developed by Pierre Schaeffer, beginning in the early 1940s.

This method of music creation has inspired many new forms of experimental music, where the goal is to produce new sounds, not replicate instruments. Many bands use the technique, The Beatles, And Pink Floyd for example.

Musique Concrete Informational video, explaining the whole process how music was made with the machine from the BBC:


Here is an example of Musique Concrete done electronically, demonstrating the ASDR of it.
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Here's a list of techniques used during the musique concrete process:

A. Turntable

1. "locked-groove"

2. speed manipulation

3. reverse direction

B. Tape
1. Compositional Splicing
-ordering of material
-splicing envelopes; attacks mask splices
-create new envelopes
-partially replaced by sampling
-splicing still useful, as digital editing is expensive
-classical, popular recordings not done in one take
2. Speed displacement/manipulation
-vari-pitch tape recorder, tape speeds
-transfer from tape to tape
-slows down changes; timing of envelopes
-expanded time; moment/reverse
-useful for background
3. Tape reverse
-decays become attacks; envelopes reverse
4. Reel rocking
5. Fast forward, rewind
6. Tape Loop
-provides unity
7. Tape Echo, Delay

C. Mixing techniques
1. Panning
-sounds "travel" through space
- much easier to do with mixers w/ panning lever
2. Channeling
-separation: complete divorce; schizophrenia
3. Layering

How to cut the tape:
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