A hum is a
sound
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.
In human physiology and psychology, sound is the ''reception'' of such waves and their ''perception'' by the ...
made by producing a wordless tone with the mouth closed, forcing the sound to emerge from the
nose
A nose is a protuberance in vertebrates that houses the nostrils, or nares, which receive and expel air for respiration alongside the mouth. Behind the nose are the olfactory mucosa and the sinuses. Behind the nasal cavity, air next passes th ...
. To hum is to produce such a sound, often with a
melody
A melody (from Greek language, Greek μελῳδία, ''melōidía'', "singing, chanting"), also tune, voice or line, is a Linearity#Music, linear succession of musical tones that the listener perceives as a single entity. In its most liter ...
. It is also associated with
thoughtful absorption,
'hmm'.
A hum has a particular
timbre (or sound quality), usually a
monotone
Monotone refers to a sound, for example music or speech, that has a single unvaried tone. See: monophony.
Monotone or monotonicity may also refer to:
In economics
*Monotone preferences, a property of a consumer's preference ordering.
*Monotonic ...
or with slightly varying
tones. There are other similar sounds not produced by human singing that are also called hums, as the sound produced by
machinery
A machine is a physical system using power to apply forces and control movement to perform an action. The term is commonly applied to artificial devices, such as those employing engines or motors, but also to natural biological macromolecule ...
in operation, such as a
microwave
Microwave is a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter corresponding to frequencies between 300 MHz and 300 GHz respectively. Different sources define different frequency ran ...
, or by an
insect
Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen), three pairs ...
in flight. The
hummingbird
Hummingbirds are birds native to the Americas and comprise the biological family Trochilidae. With about 361 species and 113 genera, they occur from Alaska to Tierra del Fuego, but the vast majority of the species are found in the tropics aro ...
was named for the sound that bird makes in flight which sounds like a hum.
Mechanics
A 'hum' or 'humming' by humans is created by the resonance of air in various parts of passages in the head and throat, in the act of breathing. The 'hum' that a hummingbird creates is also created by resonance: in this case by air resistance against wings in the actions of flying, especially of hovering.
Humming in human evolution
Joseph Jordania
Joseph Jordania (Georgian იოსებ ჟორდანია, born February 12, 1954 and also known under the misspelling of Joseph Zhordania) is an Australian–Georgian ethnomusicologist and evolutionary musicologist and professor. He is ...
suggested that humming could have played an important role in the early human (hominid) evolution as
contact calls Contact calls are seemingly haphazard sounds made by many social animals (such as a chicken's cluck). Contact calls are unlike other calls (such as alarm calls) in that they are not usually widely used, conspicuous calls, but rather short exclamatio ...
. Many social animals produce seemingly haphazard and indistinct sounds (like chicken cluck) when they are going about their everyday business (foraging, feeding). These sounds have two functions: (1) to let group members know that they are among kin and there is no danger, and (2) in case of the appearance of any signs of danger (suspicious sounds, movements in a forest), the animal that notices danger first, stops moving, stops producing sounds, remains silent and looks in the direction of the danger sign. Other animals quickly follow suit and very soon all the group is silent and is scanning the environment for possible danger.
Charles Darwin
Charles Robert Darwin ( ; 12 February 1809 – 19 April 1882) was an English naturalist, geologist, and biologist, widely known for his contributions to evolutionary biology. His proposition that all species of life have descended fr ...
was the first to notice this phenomenon on the example of the wild horses and the cattle.
Joseph Jordania
Joseph Jordania (Georgian იოსებ ჟორდანია, born February 12, 1954 and also known under the misspelling of Joseph Zhordania) is an Australian–Georgian ethnomusicologist and evolutionary musicologist and professor. He is ...
suggested that for humans, as for many social animals, silence can be a sign of danger, and that's why gentle humming and musical sounds relax humans (see the use of gentle music in
music therapy,
lullabies).
Humming in language
In
Pirahã, the only surviving dialect of the
Mura language
Mura is a language of Amazonas, Brazil. It is most famous for Pirahã, its sole surviving dialect. Linguistically, it is typified by agglutinativity, a very small phoneme inventory (around 11 compared to around 44 in English), whistled speec ...
, there is a special register of speech which uses solely humming, with
no audible release.
Music
Humming is often used in music of genres, from classical (for example, the famous chorus at the end of Act 2 of
Giacomo Puccini
Giacomo Puccini (Lucca, 22 December 1858Bruxelles, 29 November 1924) was an Italian composer known primarily for his operas. Regarded as the greatest and most successful proponent of Italian opera after Verdi, he was descended from a long li ...
's ''
Madama Butterfly
''Madama Butterfly'' (; ''Madame Butterfly'') is an opera in three acts (originally two) by Giacomo Puccini, with an Italian libretto by Luigi Illica and Giuseppe Giacosa.
It is based on the short story "Madame Butterfly" (1898) by John Luther ...
'') to jazz to R&B.
Another form of music derived from basic humming is the
humwhistle. Folk art, also known as "whistle-hum," produces a high pitch and low pitch simultaneously. The two-tone sound is related to
field holler,
overtone singing, and
yodeling the music.
See also
*
Kazoo
*
The Hum – an apparently widespread phenomenon involving a low-frequency hum of unknown origin, inaudible to most people
*
Mains hum – an electric or electromagnetic phenomenon that causes a low frequency (50 or 60 Hz) audible signal
References
External links
*
{{Authority control
Sound
Singing techniques
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