altos
An alto is a woman with a relatively low singing voice. In a choir, alto describes the lowest singing part written for a female voice.
While occasionally men are described as altos — in which case, the word describes a fairly high pitched singing voice — it more often describes a woman whose voice is lower than a soprano. The word alto can also refer to other instruments, including saxophones and flutes, at specific pitches. Alto originally described a man's high voice, from a Latin root, altus, or "high."
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