John Legend

John Roger Stephens (born December 28, 1978), known professionally as John Legend, is an American singer, songwriter, pianist, and record producer. He began his musical career working behind the scenes for other artists, playing piano on Lauryn Hill's "Everything Is Everything", and performing as an uncredited backing vocalist on Jay-Z's "Encore" and Alicia Keys' "You Don't Know My Name". He was the first artist to sign with rapper Kanye West's GOOD Music, through which he released his debut ... source: https://en.wikipedia.org/wiki/John_Legend