A moment on the lips, a lifetime whirling around in my brain

This is where the concept gets even more tortured, when instead of the best song ever all my mind can conjure up are moments within songs, memorable, magic moments (ho ho) that render the rest of the song obsolete.
Let me give you two examples.
1) Dusty Springfield and the Pet Shop Boys - What Have I Done To Deserve This. Now, Dusty is fantastic but the production on this leaves her double tracked all over the place, as though the "Boys" were suspicious of the longevity of her talent. Which is fine. Now, I'm a huge admirer of Dusty's voice but it's hard to admit that in a world that judges you for such an opinion. For many a long year it has been an accepted fact that in order to like Dusty you must be gay. Or, more accurately, in order to be gay you must like Dusty. I'm reclaiming her for the straight of the species, a bit like Billy Bragg trying to reclaim the George Cross from the facists.
And there is one moment of spine tingling brilliance on this song. All she does is go slightly deeper and spread the word "Yeah" out across a couple of bars with a little sexy quiver. I hear it now and it still works wonders. A great moment in an average song.
2) John Lennon - God
This is a pickle of a song. It starts with a piano and bass line that are warm and tender before descending in the pitiful repitition of "Here's a list of all the things I'm going to whine about now that I'm now well off and you're going to have to listen and oh yes I'm going to slag off the one thing that made me famous." So once he climaxes at his hatred of the Beatles, it is as though every venomous instinct is flushed from his body. And suddenly the warmth returns, the bass line returns, the tenderness returns. And there's a greater depth to his voices as well, before reedy and tight, suddenly it flows and right at the point where he says "that's reality" you can forgive him anything. Well, almost. Imagine remains a crime against humanity.