The term 'Mezzo-Soprano Stevens' refers to the American opera singer, RISE Stevens. She was born in New York City in 1913 and began her career as a mezzo-soprano in the 1930s. She was known for her powerful voice and her ability to sing both operatic and popular music. She was also a successful film actress, appearing in several films in the 1940s and 1950s. She continued to perform until her death in 2013.