What songs would you consider "Perfect"?

What songs would you say are perfect? I've been thinking about this recently, making a list of songs I'd consider "perfect". While the songs may not be the most well written, or the most well performed, the song just feels "perfect".

Obviously a question like this has a different answer for everyone, depending on how you weight the qualities of a song. For me, there's a few I've narrowed down (not comprehensive). I'm only listing one song per artist, and also allowing covers I may prefer to the original song.

Chris Cornell - Seasons. - Seriously, if you've never given this a listen, you have to.

TOOL - Pneuma.

Jimi Hendrix - Voodoo Child (Slight Return).

Pearl Jam - Even Flow. (And to be honest, the whole Ten album).

The Allman Brothers Band - Little Martha.

Wes Montgomery - When a man loves a woman.

Steely Dan - Kid Charlemagne.

Little Feat - Lafayette Railroad.

Stevie Ray Vaughan - Little Wing.

Weather Report - Barbary Coast.

I'd love to hear everyone's opinions on what you think may make a list like this.

Thanks!

Edit: Minor spelling mistake.