As I answered a recording engineer friend a few years ago, who asked me for the three greatest pop songs of all time (in no order):
Hard Day’s Night Lennon-McCartney / Beatles
Mood Indigo Ellington-Strayhorn
Superstition Morris / Stevie Wonder
Going back a ways, and specifying country/hillbilly music:
I’m So Lonesome I Could Cry Hank Williams
The Prisoner’s Song Guy Dahlhart
Many more – I can’t think of them right now
Going back a ways, and specifying race music/blues:
Pony Blues Charley Patton
Green River Blues Charley Patton
Kansas City Blues William Harris, recorded 1927
Big Road Blues Tommy Johnson
Anything by Blind Blake.
Flashing forward, pretty much anything by Kurt Cobain, or Johnny Cash, lots of early/mid-period Beatles and lots of songs Elvis did before they drafted him.