Sound is the vibration of matter, as perceived by the sense of hearing. Unwanted or annoying sound is often called noise.

Quotes

• Carpenters' and ironworkers' shops are dominated by the heavier sounds of machinery and occasional yells across the floor; in goldsmiths' shops the silences are punctuated by more delicate work noises, but the apprentices' sullen silence and the artisans' grim absorption in the work at hand are, if anything, more oppressive, although there may be a little amiable banter between a master goldsmith and an older apprentice clearly already in possession of advanced technical skills.
  • Michael Herzfeld (2004). The Body Impolitic: Artisans and Artifice in the Global Hierarchy of Value. University of Chicago Press. p. 81. ISBN 978-0-226-32914-7. 

• Which is more musical, a truck passing by a factory or a truck passing by a music school?
  • John Cage, "Communication", the third of the Composition as a Process lectures given in Darmstadt in 1958 and published in Silence. Many of Cage's works use sounds traditionally regarded as unmusical (radios not tuned to any particular station, for instance): he really did believe that the sound of a truck and the sounds made in a factory had just as much musical worth as the sounds made in a music school. There is also a suggestion expressed in the quote that in order to determine the artistic worth of something, it is necessary to examine the context in which it exists.

• A sound does not view itself as thought, as ought, as needing another sound for its elucidation, as etc.; it has not time for any consideration--it is occupied with the performance of its characteristics: before it has died away it must have made perfectly exact its frequency, its loudness, its length, its overtone structure, the precise morphology of these and of itself.
  • John Cage (1955), quoted in Classic Essays on Twentieth-Century Music, ISBN 0028645812.

• Music has no subject beyond the combinations of notes we hear, for music speaks not only by means of sounds, it speaks nothing but sound.
  • Eduard Hanslick, quoted by Wolfgang Sandberger (1996) in the liner notes to the Juilliard String Quartet's Intimate Letters. Sony Classical SK 66840.

• You know the sound of two hands clapping; tell me, what is the sound of one hand?
  • Hakuin Ekaku (1686-1769). The phrase is a Kōan, an irrational comment used in Zen Buddhism in order to assist practitioners in reaching enlightenment.

• Phonons are displacements of atoms around their rest positions in a crystalline solid. They carry sound and heat, but are not classically associated with magnetism. Here, we show that phonons are, in fact, sensitive to magnetic fields, even in diamagnetic materials. We do so by demonstrating experimentally that acoustic phonons in a diamagnetic semiconductor (InSb) scatter more strongly from one another when a magnetic field is applied. We attribute this observation to the magnetic-field sensitivity of the anharmonicity of the interatomic bonds that govern the probability of phonon-phonon interactions.
  • Jin H, Restrepo OD, Antolin N, Boona SR, Windl W, Myers RC, Heremans JP, "Phonon-induced diamagnetic force and its effect on the lattice thermal conductivity", Nature Materials. 2015 Jun;14(6):601-6.

• His feet were like fine copper when glowing in a furnace; and his voice was as the sound of many waters.
  • John the Evangelist, Revelation 1:15.

• They say gravity is the centre of attraction ; I rather think that noise is. Nothing so soon assembles the inhabitants of a house as a loud and sudden noise:
  • Letitia Elizabeth Landon, The Book of Beauty, 1833 (1832), 'The Talisman'.

• Whenever you wash dishes, cook, or clean, if you make no sound, this is smartness itself. A person who enters a house and makes a lot of noise is revealing a lack of spirituality; even cats and dogs do not make unnecessary sounds, and man as he naturally is does not make any either.
  • Michio Kushi (1926), Spiritual Journey (1994), p. 4.

• Doctor: It plays music. What's the point of that? Oh, with music, you can dance to it, sing with it, fall in love to it. Unless you're a Dalek of course. Then it's all just noise.
  • Doctor Who, Evolution of the Daleks (2007), written by Helen Raynor.

• Could we not imagine that noise...is itself nothing more than the sum of a multitude of different sounds which are being heard simultaneously?
  • Jean-Jacques Rousseau, Dictionnaire de Musique (1767).

• If a tree falls in a forest, and no-one is around to hear it, does it make a noise?
  • Source unknown, but apparently originating in the twentieth century; a 1910 physics book asks "When a tree falls in a lonely forest, and no animal is near by to hear it, does it make a sound? Why?" Charles Riborg Mann, George Ransom Twiss, Physics (1910), p. 235. See also: If a tree falls in a forest.

• Now I will do nothing but listen,
  To accrue what I hear into this song, to let sounds contribute toward it.
  

I hear bravuras of birds, bustle of growing wheat, gossip of flames, clack of sticks cooking my meals,
I hear the sound I love, the sound of the human voice,
I hear all sounds running together, combined, fused or following,
Sounds of the city and sounds out of the city, sounds of the day and night,
Talkative young ones to those that like them, the loud laugh of work-people at their meals,
The angry base of disjointed friendship, the faint tones of the sick,
The judge with hands tight to the desk, his pallid lips pronouncing a death-sentence,
The heave'e'yo of stevedores unlading ships by the wharves, the refrain of the anchor-lifters,
The ring of alarm-bells, the cry of fire, the whirr of swift-streaking engines and hose-carts with premonitory tinkles and color'd lights,
The steam-whistle, the solid roll of the train of approaching cars,
The slow march play'd at the head of the association marching two and two,
(They go to guard some corpse, the flag-tops are draped with black muslin.)

I hear the violoncello, ('tis the young man's heart's complaint,)
I hear the key'd cornet, it glides quickly in through my ears,
It shakes mad-sweet pangs through my belly and breast.

I hear the chorus, it is a grand opera,
Ah this indeed is music--this suits me.”

• Walt Whitman, Song of Myself, section 26.

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