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.
Chris Christian Chris Christian (born February 7, 1955) is an American songwriter, record producer, and a record label executive. His songs have been recorded by Elvis Presley, Olivia Newton-John, Hall and Oates, Natalie Cole, Sheena Easton, The Pointer Sisters, Al Jarreau, The Carpenters, Amy Grant, Patti Austin, Dionne Warwick, America, The Imperials, B.J. Thomas, B W Stevenson, Marilyn McCoo, Dan Peek, Cheryl Ladd, Jane Olivor, Sandi Patti, Pat Boone, Ali Lohan, Donnie Osmond, and others.