What does alto mean?
Alto is a musical term denoting the lower of the two standard female voice parts in choral music, positioned between the soaring soprano lines and the tenor section. The word also identifies singers who perform this part and, by extension, a family of mid-to-low-pitched instruments, most famously the alto saxophone, along with the alto flute and alto clarinet. Derived from the Italian word for 'high,' which itself traces back to the Latin altus, the term carries a curious history: it originally designated high male voices singing falsetto, before women came to dominate the part. Today, alto suggests warmth, depth, and richness of tone rather than brilliance, and altos often provide the harmonic foundation that holds a choir together. Whether describing a voice, a singer, or an instrument, alto remains essential vocabulary for anyone interested in music.
nounThe lowest female singing voice in classical choral music, or the vocal part written for that range; also, by extension, a member of the alto family of instruments such as the alto saxophone or alto flute.
- The lower of the two standard female choral voice parts, sitting between soprano and tenor.
- A singer who performs the alto part, whether a woman with a low voice or a male countertenor.
- A prefix-like designation for instruments pitched in the middle-lower register of their family, such as the alto saxophone, alto flute, or alto clarinet.
"Her rich alto anchored the choir's lower harmonies throughout the performance."
"The conductor moved her to the alto section to balance the choir's low harmonies."
"He played a soulful solo on his alto saxophone at the jazz club."
The plural altos refers to multiple alto singers or voice parts within a choir or ensemble.
"The four altos blended seamlessly beneath the sopranos."
Despite coming from the Italian word for 'high,' alto names one of the lowest voices in the choir — because it originally described high male falsettists before women took over the part.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of alto
Alto comes directly from the Italian word alto, meaning 'high,' which derives from the Latin altus ('high, deep'). It entered English usage during the Renaissance period through the terminology of polyphonic choral music, where it originally referred to a high male voice — typically a falsettist or boy — singing above the tenor. As women increasingly took over this vocal line, the term shifted to describe the lower female voice part, while the related term contralto came to specify the deepest female voice type. The same Latin root altus gives English words such as altitude, altimeter, and exalt.
How alto is actually used
In modern choral practice, 'alto' describes the part rather than a fixed voice type; true contraltos are relatively rare, so many altos are actually mezzo-sopranos. In instrumental contexts, 'alto' functions attributively (as in 'alto saxophone') and is not used as a standalone noun for the instrument itself.
Easily confused with alto
Contralto refers specifically to the deepest female classical voice, while alto more broadly denotes the second-lowest choral part, which may be sung by women or by countertenors.
Tenor is the highest natural adult male voice, whereas alto denotes a lower female voice or an equivalent choral line sung above the tenors.