A perfect song? What are your choices?

Kb54's choices. Basically, yes to that. Could add 'Shape of a Heart', Jackson Browne. 'Visions of Johanna" Dylan.  for longform catagory

Father & Son - Cat Stevens on Tea For The Tillerman

Bloody Well Right - Supertramp on Crime of the Century

Lines on My Face - Frampton Comes Alive

Do You Feel Like We Do - Frampton Comes Alive

In The Mood - Glen Miller

In My Room - Yaz on Upstairs at Eric’s

The Entire Album of GRP Live in Session

The Entire Album - Russians & Americans by Al Stewart

Two songs come to mind:
The Happy Birthday song. Simple, timeless, even leaves room to improvise,
and
The Hoagy Carnmichael and Mitchell Parish American Songbook clasiic:
Stardust - A brilliant, haunting melody, and beautiful lyrics

Marc Stager
Stager Silver Solids pure silver interonnect cables
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NatCole:

Jorgen Ingmann, brilliant guitar version:

Journey - Separate Ways 

In the summertime

Mungo Jerry