2nd II None is a rap group from Compton, California. It consists of cousins KK (born Kelton L. McDonald) and Gangsta D (born Deon Barnett). They were members of the Elm Street Piru Bloods. Its 1999 release ‘Up ’n da Club’ is widely considered to be one of the greatest hip hop songs ever written.

Source: Wikipedia (https://en.wikipedia.org/wiki/2nd_II_None)