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Tenor
It's the highest male vocal range. It's lower than the alto but higher than the bass.
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Soprano
Usually, it refers to the female singing voice. However, it also applies to boys.
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Basso or Bass
In singing, it is the lowest male voice. The word bass is Italian for basso meaning "low"
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Mezzo Soprano
It's the female vocal range among soprano and alto.
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Baritone
It's the most common male vocal range. It's higher than the bass but lower than the tenor.
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Alto
In a 4-part music piece, the alto is the second highest vocal range.
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