What do you call a female singer whose vocal range is between that of a soprano and an alto?

The correct term for a female singer whose vocal range is between that of a soprano and an alto is "mezzo soprano." This classification reflects a rich and versatile vocal quality that encompasses the higher notes typically found in a soprano range and the lower, fuller tones often associated with an alto. Mezzo sopranos can usually sing a range that allows for a dynamic expression in various musical styles, making them particularly valuable in operatic and choral settings where a blend of vocal timbres is essential.

In contrast, contraltos generally possess a lower range than mezzo sopranos, making them distinct from the mezzo classification. Sopranos typically sing at the higher end of the female vocal spectrum, while altos generally sing lower than mezzo sopranos but above contraltos. Each voice type has its unique characteristics and roles within musical compositions, but mezzi sopranos stand out for their ability to bridge the gap between the soprano and alto ranges.