The alto is the lower female voice part in choral music, typically spanning F3 to F5 with a tessitura of G3 to D5. In Hz, this runs from 174.6 Hz (F3) to 698.5 Hz (F5). It is important to understand that “alto” is a choral voice part designation, not a classical voice type — most women who sing alto in a choir are actually mezzo-sopranos, while true contraltos (the classical equivalent of the choral alto) are significantly rarer.
Alto Vocal Range at a Glance
| Detail | Value |
|---|---|
| Choral Range | F3–F5 |
| Tessitura | G3–D5 |
| Lowest Note | F3 (174.6 Hz) |
| Highest Note | F5 (698.5 Hz) |
| Frequency Span | 174.6 Hz – 698.5 Hz |
| Choral Subdivision | Alto 1 (higher) / Alto 2 (lower) |
| Classical Equivalent | Mezzo-soprano or Contralto |
| Most Common Voice Type | Mezzo-soprano singing in the alto part |
What Is an Alto?
In choral music, “alto” refers to the lower female voice part in a standard SATB choir (Soprano, Alto, Tenor, Bass). The alto section sings below the sopranos and above the tenors, providing harmonic richness in the mid-to-lower female register.
The term comes from the Latin altus (“high”) — historically used for the highest adult male voice part in Renaissance choral music, before the modern meaning shifted to refer to the lower female part.
Alto vs Contralto: A Critical Distinction
This is the most important clarification in female voice terminology:
| Term | Type | Definition |
|---|---|---|
| Alto | Choral voice part | The lower female section in a choir — any female voice that sings these notes |
| Contralto | Classical voice type | The lowest female voice type, with characteristic dark resonance below G3 |
All contraltos sing alto in choirs. But most altos are NOT contraltos — they are mezzo-sopranos (the most common female voice type) singing in the lower choral section. True contraltos are rare; genuine altos are not.
For the detailed comparison, see alto vs contralto.
Alto vs Mezzo-Soprano
| Feature | Alto (choral) | Mezzo-Soprano (voice type) |
|---|---|---|
| Definition | Choral part designation | Classical voice type |
| Range used in choir | F3–F5 | Assigned to soprano or alto section based on tessitura |
| Most common voice type singing here | Mezzo-soprano | — |
| Classical solo range | — | G3–B5 |
Most mezzo-sopranos with lower tessituras sing in the alto section of choirs. Higher mezzos may be assigned to the second soprano section. See alto vs mezzo-soprano.
Alto Range in Hz: Complete Reference
| Note | Hz | Significance |
|---|---|---|
| F3 | 174.6 Hz | Alto choral range floor |
| G3 | 196.0 Hz | Tessitura start |
| A3 | 220.0 Hz | Comfortable mid-range for altos |
| C4 (Middle C) | 261.6 Hz | Key passaggio zone for mezzo voices |
| A4 | 440.0 Hz | Upper mid-range |
| D5 | 587.3 Hz | Tessitura ceiling for altos |
| F5 | 698.5 Hz | Choral range ceiling |
For complete Hz references across all voice types, see the vocal range Hz guide.
Alto 1 vs Alto 2: Choral Subdivisions
In larger choral ensembles (SSAATB or SSAATTBB), the alto section typically divides into two parts:
Alto 1 (Upper Alto)
- Range: approximately Bb3–F5
- Tessitura: C4–D5
- Voice characteristics: Higher mezzo-soprano or dramatic mezzo; warmer upper register
- Typically sung by: Lyric and dramatic mezzo-sopranos
Alto 2 (Lower Alto)
- Range: approximately F3–C5
- Tessitura: G3–Bb4
- Voice characteristics: Lower mezzo-soprano; genuine contralto if available
- Typically sung by: Dramatic mezzos with lower tessitura, true contraltos
Use the choir voice part test to identify your specific choral placement — whether Alto 1, Alto 2, or Mezzo-Soprano.
Famous Singers With Alto or Lower Female Range
True Contraltos (Classical Alto Voice Type)
| Artist | Range | Notes |
|---|---|---|
| Marian Anderson | E3–C6 | Definitive 20th-century classical contralto |
| Karen Carpenter | E3–A5 | Lyric contralto with remarkable clarity |
| Nina Simone | F3–Eb5 | Dramatic contralto; jazz-blues context |
| Tracy Chapman | E3–C5 | Dark, earthy lower register; archetypal contralto sound |
| Annie Lennox | F3–C5 | Lyric contralto with powerful chest voice |
| Cher | E3–D5 | Dramatic contralto tendencies in the lower register |
Mezzo-Sopranos Who Sing Alto Parts
| Artist | Range | Voice Type |
|---|---|---|
| Beyoncé | A2–Bb5 | Dramatic mezzo; often sings in soprano range |
| Adele | A2–E5 | Dramatic mezzo; alto-range tessitura |
| Billie Eilish | A2–G5 | Lower mezzo; natural alto character |
| Alanis Morissette | G2–E5 | Mezzo with darker lower register |
| Amy Winehouse | D3–D6 | Dramatic mezzo; lower tessitura |
How the Alto Part Functions in Choral Music
The alto voice part serves several essential functions in choral harmony:
Inner harmony: In four-part SATB harmony, the alto provides the inner harmonic voice between the soprano melody and the tenor/bass foundation. The alto typically moves in contrary motion to the soprano, filling in the harmonies.
Choral blend: The alto’s mid-range warmth (G3–D5) provides tonal richness that soprano and tenor voices — at their extremes — cannot supply. Without strong altos, choral sound becomes top-heavy and bright.
Contrapuntal independence: In polyphonic music (Bach chorales, Renaissance motet), the alto is a fully independent melodic voice with its own line — not just a harmony filler.
Am I an Alto or a Mezzo-Soprano?
This is one of the most common questions in female voice classification. The answer depends on what context you’re in:
In a choir: If you sing the alto part comfortably and find the soprano part consistently too high, you are an alto in that choral context.
As a voice type: You need to know whether you are a true contralto (dark, heavy lower register with characteristic resonance below G3) or a mezzo-soprano (the most common female type, comfortable from G3 to B5). Most women who identify as “altos” are mezzos.
Tests to help determine:
- Voice type test — full classification
- Choir voice part test — specific choral placement
- Find my vocal range online — maps your exact range
- Voice Hz test — measures your speaking voice frequency
Your speaking voice frequency is an important clue: mezzo-sopranos typically speak around A3–D4 (220–294 Hz); true contraltos often speak at or below G3 (196 Hz).
Alto Range Compared to Other Female Voice Types
| Voice Type | Range | Tessitura | Character |
|---|---|---|---|
| Soprano | C4–C6 | C5–A5 | Highest female voice; bright upper register |
| Mezzo-soprano | G3–B5 | A3–G5 | Most common; warm mid-range |
| Alto (choral part) | F3–F5 | G3–D5 | Lower choral part; sung by mezzos and contraltos |
| Contralto | E3–G5 | F3–E5 | Darkest and lowest female voice type; rare |
Frequently Asked Questions
What is the alto vocal range? In choral music, the alto part typically spans F3 to F5 (174.6–698.5 Hz), with a tessitura of G3 to D5. This is a voice part designation, not a classical voice type.
Is alto the same as contralto? No. Alto is a choral voice part — the lower female section in a choir. Contralto is a classical voice type — the lowest female voice. All contraltos sing alto, but most altos are mezzo-sopranos (the most common female voice type). See alto vs contralto.
What is the difference between alto and mezzo-soprano? Alto is a choral assignment; mezzo-soprano is a voice type. Most women who sing alto in choirs are mezzo-sopranos. See alto vs mezzo-soprano.
Who are famous alto singers? Karen Carpenter, Tracy Chapman, Nina Simone, Marian Anderson, and Annie Lennox are among the most frequently cited genuine contralto/alto voices. Beyoncé and Adele are mezzo-sopranos who sing in the alto range in choral contexts.
How do I know if I’m an alto? If you find soprano parts consistently too high in their original keys and are most comfortable singing in the G3–D5 zone, you likely sing alto in a choral context. Whether you are technically a mezzo-soprano or a true contralto depends on the weight and resonance of your lower register — use the voice type test for a definitive answer.
What Hz is the alto range? The choral alto range runs from approximately 174.6 Hz (F3) to 698.5 Hz (F5). The most comfortable tessitura zone is G3–D5 (196–587.3 Hz).