. "Leon Youngblood Jr."@en . "solo_singer" . . . "Leon \"Roccstar\" Youngblood Jr. (born October 31, 1989) is a Grammy-nominated American music producer, songwriter, recording artist and rapper. Youngblood has written and produced songs for artists such as Chris Brown, Rihanna, Usher, Rita Ora, Fergie, Prince Royce, Kendrick Lamar, J.Lo, Iggy Azalea, and Melissa Etheridge.Youngblood is signed to Atlantic Records as an artist. The music video for his own debut single, \"Confidence,\" premiered on Billboard in 2014."@en . . "1989-10-31Z"^^ . "American rapper" . . "Youngblood, Leon Roccstar"@en . . . . "1989Z"^^ . . . "RoccStar"@en . .