A perfect song? What are your choices?

Can’t tell if you are being facetious but Waterloo Sunset is about an area in London near a train station called Waterloo Underground.

https://en.wikipedia.org/wiki/Waterloo_Sunset

I mixed up the song))) ... I don’t listen to such music at all - the consonant name misled ... there was some other one - about the war ...
but this one - I don’t like this one either (especially after I introduced it - the Thames, the bridge, a couple in love, the station, obviously nearby are fields fertilized with human bones))) ..... )

something funny is better ... youth is the sun (oh - I caught myself thinking that this film also featured a fertilizer plant))) ... )

"Waterloo Sunset" just may be my favorite song written and recorded by any UK band. In it I hear the same sense of wistful melancholy as I do from Brian Wilson's "God Only Knows". Very distinguished company to keep.

I consider The Kinks' 4-album run of Face To Face, Something Else, The Village Green Preservation Society, and Arthur as the high water mark of British Pop music, far better to my musical taste and sensibilities than that of The Beatles during the same period. 

Stephen Sondheim's "Send in the Clowns." Simple, elegant melody and poetic, insightful lyrics are matched beautifully.