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.
Clarence McDonald Clarence "Mac" McDonald is a Los Angeles-based pianist, composer, arranger, and producer. McDonald is known for his musical diversity, enduring melodies and signature groove. His most famous composition is "Silly" sung by Deniece Williams in 1981 and Taral Hicks in 1997. In 2010 the song instrumental intro and bridge were sampled in Monica's seven weeklong Billboard #1 RB Grammy nominated song "Everything To Me". He has worked with a long list of entertainment icons including Ray Charles, Barbra Streisand, Ella Fitzgerald, Justin Timberlake, Aretha Franklin, James Taylor, Carole King, Taral Hicks, Freddy Hubbard, Nancy Wilson, Boz Scaggs, Seals & Crofts, Bill Withers, and The Jackson 5.