A hum is a sound with a particular timbre (or sound quality), usually a monotone or with slightly varying tones, often produced by machinery in operation or by insects in flight. To hum is to produce such a noise, with humans vocally producing such a sound, humming, though most often with a melody. A schematic representation of hearing. ... In music, timbre (French, IPA /tæmbər/ as in the first two syllables of tambourine) is the quality of a musical note or sound which distinguishes different types of sound production or musical instruments. ... In mathematics, functions between ordered sets are monotonic (or monotone) if they preserve the given order. ... Sine waves of various frequencies; the lower waves have higher frequencies than those above. ... A machine is any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of tasks. ... Classes & Orders Subclass: Apterygota Orders Archaeognatha (Bristletails) Thysanura (Silverfish) Monura - extinct Subclass: Pterygota Orders Ephemeroptera (mayflies) Odonata (dragonflies and damselflies) Diaphanopteroidea - extinct Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Infraclass: Neoptera Orders Blattodea (cockroaches) Isoptera (termites) Mantodea (mantids) Dermaptera (earwigs) Plecoptera (stoneflies) Orthoptera (grasshoppers, etc) Phasmatodea (walking sticks) Embioptera (webspinners) Zoraptera... In general usage, noise can be considered data without meaning; that is, data that is not being used to transmit a signal, but is simply produced as an unwanted by-product of other activities. ... In music a singer or vocalist is a type of musician who sings, i. ... Look up melody in Wiktionary, the free dictionary In music, a melody is a series of linear events or a succession, not a simultaneity as in a chord. ...

The action of humming is produced simply by producing a wordless tone, such as in scat singing or vocables (wordless forms of singing), but with the mouth completely closed so that the sound emerges from the nose. This necessarily keeps the volume at a low level, so humming is often not useful in musical productions, but is nonetheless sometimes used. Scat singing is vocalizing either wordlessly or with nonsense words and syllables as employed by jazz singers who create the equivalent of an instrumental solo using only the voice. ... A vocable is a word used without meaning. ... Singing is the act of producing musical sounds with the voice, often constrasted with speech. ... Human nose The Nose is a story by Gogol and an opera by Dmitri Shostakovich. ... Volume, also called capacity, is a quantification of how much space an object occupies. ...

Often, people hum either individually or when in group singing when they don't know the words or lyrics. Lyrics are the written words in a song. ...

Frank Zappa used hum as a pun in his song, Dynamo Hum, with the reference being both to the hum made by a generator (dynamo) in operation, and to the humming action of a woman giving fellatio. Hummer is a form of oral sex. Frank Zappa Frank Vincent Zappa (December 21, 1940 – December 4, 1993) was an American singer, guitarist, composer and satirist. ... A pun (also known as paronomasia) is a figure of speech which consists of a deliberate confusion of similar words or phrases for rhetorical effect, whether humorous or serious. ... A song is a relatively short musical composition for the human voice (possibly accompanied by other musical instruments), which features words (lyrics). ... Electrical generator Generator (Mathematics) ... Dynamo can refer to more than one item. ... Cunnilingus Oral sex consists of all the sexual activities that involve the use of the mouth, tongue, etc. ... Cunnilingus Oral sex consists of all the sexual activities that involve the use of the mouth, tongue, etc. ...

HUM could also refer to a group of classes called Humanitites, or more widely known as literature or english courses.

See also

• The Hum - an apparently widespread phenomenon involving a low-frequency hum of unknown origin, inaudible to most people

Hum was also a band. Phenomenon involving a persistent and invasive low-frequency noise of a humming character and unknown origin, not audible to all people, reported widely throughout the world. ... Pictured left to right: Bryan St. ...