the late 1960s to late 1970s produced the best music ever IMO. hard rock (Zeppelin, Lynard Skynard, Aerosmith, Black Sabbath etc.), disco, R&B (see list above), Soul, American Folk Rock (Crosby Stills Nash etc.). After CSN and the like, R&B is my favorite. those guys could sing, write songs, play music and mostly importantly DANCE.
none of the music today can touch the musicians of that era. NONE. take for instance Earth Wind & Fire. you had world class musicians, song writers, singers arrangers, producers and to boot super cool people that everyone wanted to look like/imitate.