John Legend
John Roger Stephens, 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 studio album, Get Lifted (2004). Preceded by the hit ballad "Ordinary People", the album reached the top ten of the Billboard 200 and received double platinum certification by the Recording Industry Association of America (RIAA).
Read more on Wikipedia