女中音 (nǚ zhōng yīn) refers to the female mezzo-soprano voice type in classical music. This vocal range lies between the soprano and contralto, typically spanning from A3 to A5. Mezzo-sopranos often portray characters that are more complex and mature, making them essential in operas and choral works. In opera, 女中音 roles often include supporting characters, mothers, or witches, showcasing a rich and warm tone. Famous mezzo-sopranos like Cecilia Bartoli and Marilyn Horne have made significant contributions to the genre, performing in various operatic and concert settings worldwide.