What Is The Most Romantic Song That You Have Ever Listen To?

Great topic... I’ll add these:

You Must Believe in Spring -  ( Legrand & Bergman ) Tierney Sutton has made a beautiful version of this.

Long Ago and Far Away - ( Kern and Gershwin ) - Jo Stafford

Every Time We Say Goodbye - ( Porter ) - Ella Fitzgerald

Little Prayer - Dave Catney and Sandra Dudley 

“Don’t give up” - Peter Gabriel

How about "Extreme-More than words"?

There are so many, but two that come to mind are Gato Barbieri's Europa, and Van Morrison's Wild Honey

Too many to list, so 3 suggestions. 1st is from the '60s but I didn't hear it 'til 2 years ago. 2nd is very recent. 3rd is classic bossa nova.  All 3 are quite romantic (and blue):

Irma Thomas/"Anyone Who Knows What Love Is (Will Understand)"
https://www.youtube.com/watch?v=wPT4UizFUEY

Melody Gardot/"Sunset in Blue":
https://www.youtube.com/watch?v=qndrrfdmPIA&list=RDMM7_XiW7VrQSo&index=2

Astrid Gilberto/"How Insensitive" (even through translation, the words are beautiful & sad):
https://www.youtube.com/watch?v=XxVWqOdn150