George Clinton, the leader of Parliament and Funkadelic, was the next great funkster. Clinton expanded Stone's blueprint, adding wild conceptual fantasies derived from the psychedelia of Sgt. Pepper and the counterculture humor of Frank Zappa. But the main signature of Clinton's music was how he kept working one groove, how he kept jamming over a deep bass line and adding instrumental breaks. Most of the funk bands of the '70s picked up on the groove, not the concepts, though funk and hip-hop groups in the '80s and '90s would expand on both the sound and the concept.
Blues music feels moody, is improvisional, and has fun even when it's sad.
At its core, the blues has remained the same since its inception. Most blues feature simple, usually three-chord, progressions and have simple structures that are open to endless improvisations, both lyrical and musical. The blues grew out of African spirituals and worksongs. In the late 1800s, southern African-Americans passed the songs down orally, and they collided with American folk and country from the Appalachians. New hybrids appeared by each region, but all of the recorded blues from the early 1900s are distinguished by simple, rural acoustic guitars and pianos.