A perfect song? What are your choices?

Woman to Woman - Joe Cocker

Nothing But a Heartache - The Flirtations

Knock On Wood - Eddie Floyd

I'll Take You There - Staple Singers

Don't Worry Baby - Beach Boys

Crimson and Clover - Tommy James & Shondells

Waterloo Sunset - Kinks (+1)

Venus - Shocking Blue

She's Not There - Zombies

My definition of a perfect song is one that is written and performed so well that it is impossible to grow tired of it, no matter how much it gets overplayed. A few examples that immediately come to mind are:

I'll Be the One - Badfinger

The Morning Fog - Kate Bush

Tired of Waiting - The Kinks

All I Want - Toad the Wet Sprocket

I'm Looking Through You - The Beatles

Out of Time - Rolling Stones

Be My Baby - The Ronettes (+1)

Hallelujah - Prefab Sprout

("I seek to express my belief, that sweet talk like candy rots teeth")

Don't Marry Her (F**k Me) - The Beautiful South

Columbus - The Church

I'll Carry the Torch - Firetown (no idea why Butch Vig disowned this one)

Bow Down - Housemartins

Achin' To Be - The Replacements

I'm On Fire - Dwight Twilley Band

@larsman  - Thanks, that is indeed a great song. Over the years I've been surprised by friends of mine who grew up in a different region(s) of the country who had never heard that song. Maybe that's why it wasn't a bigger hit, as it surely deserved to be bigger than it was.

Fans of the "power pop" genre might want to seek out the 3 individual "Poptopia" (Power Pop Classics from the 70's - 80's - 90's) CD's that Rhino released in 1997, as there are many candidates have or still could make this list. 

@bdp24 - I agree that Starry Eyes by The Records is a power pop classic.

My best discovery from those Poptopia CD's both came from Volume 3 (90's):

1) Jessica Something - The Tearaways

2) Proto - Pretty - Wondermints

The Wondermints have been part of Brian Wilson's touring band since 1999.

That Is Why - Jellyfish (Jeez, how could I have forgotten this one?)

I Wanted To Tell You - Matthew Sweet

Tell Your Sister - Lloyd Cole

In addition to appearing on each other's records in the early 90's, Lloyd and Matthew were also both using Fred Maher on drums and Richard Lloyd on guitar. No wonder they made some of their best records during this period! 

+ 1 Hurdy Gurdy Man.

The backing musicians on that track are the core of Led Zeppelin (Page - Jones & Bonham), plus Alan Holdsworth. Not too shaby! Rumor has it that Page played the guitar riff to Season of The Witch at the soundcheck for every Zeppelin show.

@larsman - Per Wikipedia: There is dispute as to the musicians that played on this track The booklet from the 1992 double CD "Troubadour - Definitive Collection 64 - 76" lists Jimmy Page and Alan Holdsworth as the guitar players.

However, Wikipedia goes on to mention Alan Parker as well.