Digital Underground was an American alternative hip hop group from Oakland, California. Their personnel changed and rotated with each album and tour. Digital Underground's leader and mainstay was Greg "Shock G" Jacobs (also known as Humpty Hump); Shock G formed the group in 1987 with Jimi "Chopmaster J" Dright of Berkeley, California, and Tampa hip-hop radio deejay Kenneth "Kenny-K" Waters. Heavily influenced by the various funk bands of the 1970s, Digital Underground sampled such music frequently, which became a defining element of West Coast rap. As "Rackadelic", Jacobs designed album covers and cartoon-laced liner notes, in homage to Parliament-Funkadelic album designs.