We want to attune and regulate this tremendous variety of noises harmonically and rhythmically.

To attune noises does not mean to detract from all their irregular movements and vibrations in time and intensity, but rather to give gradation and tone to the most strongly predominant of these vibrations.

Noise in fact can be differentiated from sound only in so far as the vibrations which produce it are confused and irregular, both in time and intensity.

Every noise has a tone, and sometimes also a harmony that predominates over the body of its irregular vibrations.

Now, it is from this dominating characteristic tone that a practical possibility can be derived for attuning it, that is to give a certain noise not merely one tone, but a variety of tones, without losing its characteristic tone, by which I mean the one which distinguishes it. In this way any noise obtained by a rotating movement can offer an entire ascending or descending chromatic scale, if the speed of the movement is increased or decreased.

Every manifestation of our life is accompanied by noise. The noise, therefore, is familiar to our ear, and has the power to conjure up life itself. Sound, alien to our life, always musical and a thing unto itself, an occasional but unnecessary element, has become to our ears what an overfamiliar face is to our eyes. Noise, however, reaching us in a confused and irregular way from the irregular confusion of our life, never entirely reveals itself to us, and keeps innumerable surprises in reserve. We are therefore certain that by selecting, coordinating and dominating all noises we will enrich men with a new and unexpected sensual pleasure.

Although it is characteristic of noise to recall us brutally to real life, the art of noise must not limit itself to imitative reproduction. It will achieve its most emotive power in the acoustic enjoyment, in its own right, that the artist's inspiration will extract from combined noises.

Luigi Russolo - 'The Art of Noises'