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

Something - The Beatles
My Love - Paul McCartney
Maybe I’m amazed - Paul McCartney
You’re in my heart - Rod Stewart
Beautiful View - Ron Sexsmith
I’ll never find another you - The Seekers
Too beautiful to last - Engelberg Humperdinck
Time in a bottle - Jim Croce

A few more that I can think of:

How deep is your love - Bee Gees
Words - Bee Gees
To love somebody - Bee Gees
You're my home - Billy Joel
Annie's song - John Denver
My eyes adored you - Frankie Valli

"Your Song" is a great song by Elton John.  There is another romantic one in his debut album that I like very much:

I Need You to Turn To