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The Tenor Voice is the highest of the main male vocal types that most people would be familiar with, with the typical tenor vocal range lying between the C note one octave below middle C (C3) to the C note one octave above middle C (C5)!
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.