Rock City, also known as R. City and Planet VI, is an American musical duo formed in 2003, from Saint Thomas, U.S. Virgin Islands. 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 are perhaps best known for writing and producing hit singles for several prominent artists, including Sean Kingston ("Take You There"), Miley Cyrus ("We Can't Stop"), Nicki Minaj ("Only") and Rihanna ("Pour It Up"), among others. The duo has also contributed to numerous Grammy-nominated albums including Rihanna's Unapologetic (which won Best Urban Contemporary Album), Jennifer Hudson's self-titled album (which won Best R&B Album), and Ariana Grande's My Everything (which was nominated for Best Pop Vocal Album).