NWA, or Nigga With Attitude, is one of the most influential group in Hip Hop, not because entirely of their persona, but the undiluted streetness that they protrude in their lyrics and songs. Their careers took on a greater influence on hip hop separately than they had ever influenced it together.
Gil Scott-Heron, soul & jazz poet, musician, author, & self-described "bluesologist". He was primarily known as a spoken word performer, addressing social & political issues, particularly with his popular "The Revolution Will Not Be Televised" work. His music, notably on Pieces of a Man and Winter in America, influenced & helped engender later African-American music genres such as hip hop & neo soul. Music writers have described him as "the godfather of rap" & "the Black Bob Dylan". R.I.P.