Luigi Russolo and his assistant, Ugo Piatti, in their Milan studio with their intonarumori (noise machines), January 1, 1913, in L’Arte dei rumori (Art of noise), by Russolo, 1916Ink, crayon, and cut-and-pasted printed paper on paperThe Museum of Modern Art, New York. Gift of the Benjamin and Frances Benenson FoundationAudio courtesy of Acoustiguide