Jagged Edge is an American R&B group. Signed through Jermaine Dupri's So So Def Recordings to Columbia Records from 1997 to 2002, the group has had a number of hit singles, many of which are produced by Dupri. The group's members include identical twin lead singers Brandon and Brian Casey as well as Kyle Norman and Richard Wingo. In addition to writing the bulk of the group's material, the Casey brothers have also written for Usher, Nivea and Toni Braxton.