Define "greatest." Is it the ability to be more prolific than anybody else? Or is it the ability to achieve genius if only for a moment?

My personal favorites in no particular order...

Elton John/Bernie Taupin
Lennon/McCartney
Dylan
Harry Chapin
Cobain
Springsteen
Jim Steinman
Tom Waits

I know that last one may look a little strange, but that's why people say Tom Waits for no man.

tony b.

"Kid, these are my f**kin' work clothes."
"You look good in them golf shoes. You should buy 'em"