Singing
Singing is the art of creating music with the voice. It is the oldest form of musical expression, and the human voice can be considered the first musical instrument by some. The definition of singing varies across sources. Some sources define singing as the act of creating musical sounds with the voice. Other common definitions include "the utterance of words or sounds in tuneful succession" or "the production of musical tones by means of the human voice".
A person whose profession is singing is called a singer or a vocalist. Singers perform music that can be sung with or without accompaniment by musical instruments. Singing is often done in an ensemble of musicians, such as a choir. Singers may perform as soloists or accompanied by anything from a single instrument up to a symphony orchestra or big band. Many styles of singing exist throughout the world.
Singing can be formal or informal, arranged, or improvised. It may be done as a form of religious devotion, as a hobby, as a source of pleasure, comfort, as part of a ritual, during music education or as a profession. Excellence in singing requires time, dedication, instruction, and regular practice. If practice is done regularly then the sounds can become clearer and stronger. Professional singers usually build their careers around one specific musical genre, such as classical or rock, although there are singers with crossover success. Professional singers typically receive voice training from vocal coaches or voice teachers throughout their careers.
Singing should not be confused with rapping as they are not the same. According to music scholar and rap historian Martin E. Connor, "Rap is often defined by its very opposition to singing." While also a form of vocal music, rap differs from singing in that it does not engage with tonality in the same way and does not require pitch accuracy. Like singing, rap does use rhythm in connection to words but these are spoken rather than sung on specific pitches. Grove Music Online states that "Within the historical context of popular music in the United States, rap can be seen as an alternative to singing that could connect directly with stylistic speech practices in African American English." However, some rap artists do employ singing as well as rapping in their music; using the switch between the rhythmic speech of rapping and the sung pitches of singing as a striking contrast to grab the attention of the listener.
Voices
In its physical aspect, singing has a well-defined technique that depends on the use of the lungs, which act as an air supply or bellows; on the larynx, which acts as a reed or vibrator; on the chest, head cavities and the skeleton, which have the function of an amplifier, as the tube in a wind instrument; and on the tongue, which together with the palate, teeth, and lips articulate and impose consonants and vowels on the amplified sound. Though these four mechanisms function independently, they are nevertheless coordinated in the establishment of a vocal technique and are made to interact upon one another. During passive breathing, air is inhaled with the diaphragm while exhalation occurs without any effort. Exhalation may be aided by the abdominal, internal intercostal and lower pelvis/pelvic muscles. Inhalation is aided by use of external intercostals, scalenes, and sternocleidomastoid muscles. The pitch is altered with the vocal cords. With the lips closed, this is called humming.The sound of each individual's singing voice is entirely unique not only because of the actual shape and size of an individual's vocal cords, but also due to the size and shape of the rest of that person's body. Humans have vocal folds which can loosen, tighten, or change their thickness, and over which breath can be transferred at varying pressures. The shape of the chest and neck, the position of the tongue, and the tightness of otherwise unrelated muscles can be altered. Any one of these actions results in a change in pitch, volume, timbre, or tone of the sound produced. Sound also resonates within different parts of the body and an individual's size and bone structure can affect the sound produced by an individual.
File:Fællessang, Bogforum 2025.jpg|thumb|People singing together at Bella Center in Copenhagen, 2025
Singers can also learn to project sound in certain ways so that it resonates better within their vocal tract. This is known as vocal resonation. Another major influence on vocal sound and production is the function of the larynx which people can manipulate in different ways to produce different sounds. These different kinds of laryngeal function are described as different kinds of vocal registers. The primary method for singers to accomplish this is through the use of the singer's formant; which has been shown to match particularly well to the most sensitive part of the ear's frequency range.
It has also been shown that a more powerful voice may be achieved with a fatter and fluid-like vocal fold mucosa. The more pliable the mucosa, the more efficient the transfer of energy from the airflow to the vocal folds.
Vocal classification
In European classical music and opera, voices are treated like musical instruments. Composers who write vocal music must have an understanding of the skills, talents, and vocal properties of singers. Voice classification is the process by which human singing voices are evaluated and are thereby designated into voice types. These qualities include but are not limited to vocal range, vocal weight, vocal tessitura, vocal timbre, and vocal transition points such as breaks and lifts within the voice. Other considerations are physical characteristics, speech level, scientific testing, and vocal registration. The science behind voice classification developed within European classical music has been slow in adapting to more modern forms of singing. Voice classification is often used within opera to associate possible roles with potential voices. There are currently several different systems in use within classical music including the German Fach system and the choral music system among many others. No system is universally applied or accepted.However, most classical music systems acknowledge seven different major voice categories. Women are typically divided into three groups: soprano, mezzo-soprano, and contralto. Men are usually divided into four groups: countertenor, tenor, baritone, and bass. With regard to voices of pre-pubescent children, an eighth term, treble, can be applied. Within each of these major categories, several sub-categories identify specific vocal qualities like coloratura facility and vocal weight to differentiate between voices.
Within choral music, singers' voices are divided solely on the basis of vocal range. Choral music most commonly divides vocal parts into high and low voices within each sex. As a result, the typical choral situation gives many opportunities for misclassification to occur. Since most people have medium voices, they must be assigned to a part that is either too high or too low for them; the mezzo-soprano must sing soprano or alto and the baritone must sing tenor or bass. Either option can present problems for the singer, but for most singers, there are fewer dangers in singing too low than in singing too high.
Within contemporary forms of music, singers are classified by the style of music they sing, such as jazz, pop, blues, soul, country, folk, and rock styles. There is currently no authoritative voice classification system within non-classical music. Attempts have been made to adopt classical voice type terms to other forms of singing but such attempts have been met with controversy. The development of voice categorizations were made with the understanding that the singer would be using classical vocal technique within a specified range using unamplified vocal production. Since contemporary musicians use different vocal techniques and microphones and are not forced to fit into a specific vocal role, applying such terms as soprano, tenor, baritone, etc. can be misleading or even inaccurate.
Vocal registration
Vocal registration refers to the system of vocal registers within the voice. A register in the voice is a particular series of tones, produced in the same vibratory pattern of the vocal folds, and possessing the same quality. Registers originate in laryngeal function. They occur because the vocal folds are capable of producing several different vibratory patterns. Each of these vibratory patterns appears within a particular range of pitches and produces certain characteristic sounds. The occurrence of registers has also been attributed to the effects of the acoustic interaction between the vocal fold oscillation and the vocal tract. The term "register" can be somewhat confusing as it encompasses several aspects of the voice. The term register can be used to refer to any of the following:- A particular part of the vocal range such as the upper, middle, or lower registers.
- A resonance area such as chest voice or head voice.
- A phonatory process
- A certain vocal timbre or vocal "color"
- A region of the voice which is defined or delimited by vocal breaks.