Rock City, also known as R. City and Planet VI, is an American musical duo from Saint Thomas, U.S. Virgin Islands, formed in 2003. The duo, composed of brothers Theron and Timothy Thomas, who use the stage names, A.I. and Uptown AP respectively, are also a songwriting and record production team. The Thomas brothers also write and produce for other artists, including Jamaican artiste, Sean Kingston ("Take You There"), American singer, Miley Cyrus ("We Can't Stop"), Trinidadian rapper Nicki Minaj ("Only") and Barbadian popstar Rihanna ("Pour It Up").