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.
Billy Steinberg William Endfield "Billy" Steinberg (born February 26, 1950) is an American songwriter. He achieved his greatest success in the 1980s with songwriting partner Tom Kelly; together the two wrote or co-wrote the No. 1 hits "Like a Virgin" by Madonna (1984), "True Colors" by Cyndi Lauper (1986), "Eternal Flame" by the Bangles (1989), "So Emotional" by Whitney Houston (1987) and "Alone" (covered by Heart in 1987). They also wrote or co-wrote the hit songs "I Drove All Night" (recorded by various artists, 1987), "I Touch Myself" by Divinyls (1990), and "I'll Stand By You" by The Pretenders (1994).