Vocal range

Vocal range is the span of pitches a human voice can phonate. In common use, it refers to the distance between the lowest and highest notes a person produces. However, in the world of singing, the definition is often more specific. Vocal pedagogists, who are teachers of singing, define range as the total span of musically useful pitches. This distinction matters because some notes may be physically possible but not practical for performance. For example, an opera singer must project their voice over a large orchestra without a microphone. Their usable range is limited to notes they can project adequately. In contrast, a pop artist can use a microphone to include much quieter notes in their range.

The human voice produces sound through different physiological processes within the larynx, which is the voice box. These different modes of production are known as vocal registers. While the exact number of registers is a subject of debate among singers, scientists identify four distinct types. These include the whistle register, the falsetto register, the modal register, and the vocal fry register. The modal register is used for normal speech and most singing. Most singers define their range based only on the usable pitches within this modal register. There are exceptions to this rule, however. Countertenors often include the falsetto register, and coloratura sopranos may include the whistle register in their official vocal range.

Human voices show significant differences between the sexes, a concept known as sexual dimorphism. On average, the upper pitch range in males is about half as high as in females. This difference remains even when scientists control for body height and volume. Charles Darwin suggested that these vocal differences evolved through intersexual sexual selection. This theory proposes that female mate choices influenced the evolution of the human voice. Research by Puts has shown that preferences for male pitch can change according to the menstrual cycle. Furthermore, men may adjust their pitch based on perceived dominance during competition. This is known as intrasexual selection, where pitch relates to interpersonal power.

Vocal range is a key part of voice classification, but it is not the only factor. People often confuse vocal range with voice type, but they are different concepts. A voice type is a category based on several identifying qualities. These include vocal weight, vocal tessitura, and vocal timbre, which is the unique character of a sound. Teachers also consider vocal transition points, physical characteristics, and speech level. Tessitura is particularly important, as it describes where a voice feels most comfortable singing. A singer might have a wide range that covers two different voice types. In such cases, a teacher will use tessitura and timbre to decide the correct classification.

In classical music, several systems are used to classify voices, such as the German Fach system. These systems help opera houses match specific singers to certain roles. Most major systems agree on seven broad 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. Children's voices are often referred to as trebles. Within these categories, sub-types exist to describe specific qualities like vocal weight or coloratura facility. No single system is universally accepted across all musical traditions.

Operatic classifications provide specific, approximate ranges for the six basic voice types. The soprano is the highest female voice, typically ranging between C and G. The mezzo-soprano is the middle female voice, usually between A and G. The contralto is the lowest female voice, typically between F and C. For men, the tenor is the highest, often between D and A. The baritone is the middle male voice, typically between B and F. Finally, the bass is the lowest, ranging from G to C. These ranges are approximations and are not meant to be applied too rigidly.

Different musical settings use different naming conventions for these voices. In choral music, the system is much simpler for adult singers. Women are usually categorized as soprano or alto. Men are categorized as tenor or bass. In the United Kingdom, a man who uses falsetto to sing in the alto section is called a male alto. In most other places, the term countertenor is used instead. While countertenors are common soloists in opera, the term male alto is never used for soloists. These various systems show how vocal science and musical tradition work together to organize the human voice.