The song "Masterpiece" is by this American singer and songwriter who is  widely cited as an influence by other artists and often referred to as what?
Madonna (entertainer) Madonna Louise Ciccone ( ; born August 16, 1958) is an American singer, songwriter, actress, and businesswoman. A leading presence during the emergence of MTV in the 1980s, Madonna is known for pushing the boundaries of lyrical content in mainstream popular music, as well as visual imagery in music videos and on stage. She has also frequently reinvented both her music and image while maintaining autonomy within the recording industry. Besides sparking controversy, her works have been acclaimed by music critics. Referred to as the "Queen of Pop", Madonna is widely cited as an influence by other artists.
Nancy Wilson (jazz singer) Nancy Wilson (born February 20, 1937) is an American singer with more than seventy albums, and three Grammy Awards. She has been labeled a singer of blues, jazz, R&B, pop and soul, a "consummate actress", and "the complete entertainer". The title she prefers, however, is "song stylist". She has received many nicknames including "Sweet Nancy", "The Baby", "Fancy Miss Nancy" and "The Girl With the Honey-Coated Voice".