Chuck Berry is more a rock n' roll legend (one of the pioneers of genre actually) but Fats is earlier rhythm & blues to the bone and I wouldn't mind talking about them. We can talk about all black artists from the 50s/60s if you want. I grew up on all that music because of my dad and grandmother. Have you seen the Hail, Hail Rock n' Roll concert documentary? It's a very entertaining film half on Chuck's life story and career and half on his 60th Birthday concert celebration with guest artists.
Al Green's "Something" is something. Green's falsetto and his wails are chilling. Love all of those Temps hits. I listened to that version of Rolling Stone and there's an even longer one available if you want a bit more from that all-time classic record.