Top 5 Songs?

Cocaine Blues
Folsom Prision Blues
Ring of Fire
Hurt
Get Rhythm
Honorable Mentions
I Walk the Line
I Won’t Back Down
A Boy Named Sue

Man in Black
A Boy Named Sue
Drive On
Folsom Prison Blues
Ring of Fire

"I Walk the Line"
"Ring of Fire"
"Folsom Prison Blues"
"It Ain't Me Babe"
"Jackson"

Wanted Man
San Quentin
I walk the line
Ring of Fire
He turned the water into wine.

hurt
i still miss someone
sunday morning coming down
folsom prison blues
if i were a carpenter

A lot of my favourites are the ones he covered later

Hurt
Mercy Seat
Ain't No Grave
Rusty Cage
I Went Wandering

I feel like throwing down five "early/classic Cash", too:

Folsom Prison Blues
Walk the Line
Ring of Fire
Jackson
Boy Named Sue

Hurt
I Walk The Line
A Boy Named Sue
Highwayman
Man In Black

Has no one mentioned his best song yet?

One Piece at a Time

https://youtu.be/18cW_yHo3PY

The rumor is that the Japanese manga series "One Piece" was named after a hazy night when this song featured on the karoke machine.