Luigi Russolo took example from Ferrucio Busoni’s call to open up musical practice to all possible sounds and intonations, and therefore devised his own instruments to that end. The reason of course being that it would be difficult to bring the original sound sources to life in concert-like surroundings and the fact that the original sources didn’t lend themselves to the same type of control as regular music instruments. Although the Noise-Intoner instruments he designed and build were inspired by and based on the known sonorities of his time like the engines of cars, trains and air planes and other noise sounds like the wind, waterfalls, rustling tree leaves, the sound of canons and guns being fired, by their very nature of being imitators, they must have had a sonic characteristic all of their own. In his effort to bring these sounds into the musical domain he actually created something new altogether.

Let us wander through a great modern city with our ears more alert than our eyes and we shall find pleasure in distinguishing the rushing of water, gas, or air in metal pipes, the purring of motors that breathe and pulsate with indisputable animality, the throbbing of valves, the pounding of pistons, the screeching of mechanical saws, the jolting of trams on their tracks, the cracking of whips, the flapping of curtains and flags. We shall amuse ourselves by creating mental orchestrations of the crashing down of metal shop shutters, the slamming of doors, the bustle and
shuffling of crowds, the varied racket of railroad stations, iron foundries, spinning mills, printing plants, subways, and electrical power stations.
The Art of Noises, A Futurist Manifesto – Luigi Russolo 

The Art of Noises classified “noise-sound” into six groups:

1. Roars, Thunderings, Explosions, Hissing roars, Bangs, Booms
2. Whistling, Hissing, Puffing
3. Whispers, Murmurs, Mumbling, Muttering, Gurgling 
4. Noises obtained by beating on metals, woods, skins, stones, pottery, etc.
5. Voices of animals and people, Shouts, Screams, Shrieks, Wails, Hoots, Howls, Death rattles, Sobs 
6. Screeching, Creaking, Rustling, Buzzing, Crackling, Scraping