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Soprano range: The soprano is the highest singing voice. The typical soprano voice lies between C4 (middle C) and C6 (high C). The low extreme for sopranos is roughly A3 (just below middle C). Most soprano roles do not extend above C6 although there are several standard soprano roles that call for D6.
The opera performer with the highest voice is a soprano. A soprano is usually a woman, and she can hit the high notes. A woman who sings at the highest register is one kind of soprano, and her singing voice itself can also be called a soprano. Sometimes high-voiced male singers are described this way too, although it's more common to call them countertenors, or to describe their singing voices as falsetto.