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Russolo's Six Types of Noise

1. Bangs, thunderclaps, explosions, etc.
2. Whistles, hisses, snorts.
3. Whispers, murmurs, rustling, gurgling.
4. Screams, shrieks, buzzing, crackling, sounds produced by friction.
5. Sounds produced by striking metal, wood, stone, china, etc.
6. Animal & human cries -- roars, howls, laughter, sobs, sighs, etc.

~Luigi Russolo