What are the most Iconic songs that seem to live on and on?

They don’t necessarily reflect your favorite period such as, classic rock or jazz or folk music – nothing specific in your own period.

They are Iconic as in:

English definition of “iconic”
Adjective
Extremely famous, enduringly popular beyond the vogue, virtually timeless, especially being considered to exemplify an idea, particular opinions or a particular time…...

My example:

Louie Armstrong, What a wonderful world

I see trees of green, red roses, too,
I see them bloom, for me and you
And I think to myself
What a wonderful world.

I see skies of blue, and clouds of white,
The bright blessed day, the dark sacred night
And I think to myself
What a wonderful world.

The colors of the rainbow, so pretty in the sky,
Are also on the faces of people going by.
I see friends shaking hands, sayin’, “How do you do?”
They’re really sayin’, “I love you.”

I hear babies cryin’. I watch them grow.
They’ll learn much more than I’ll ever know
And I think to myself
What a wonderful world

Yes, I think to myself
What a wonderful world