Your ONE all time favorite love song?

For me it's "The First Time Ever I Saw Your Face" by Roberta Flack, from her CD "Softly with These Songs, the Best of Roberta Flack", on Atlantic. I'm looking for LOVE SONGS. Thanks and Cheers. Craig
Thanks, John (Roxy54). Although I'm familiar with, and somewhat like, a lot of the Airplane's work, somehow I had overlooked "Today." Enjoyed listening to it.

Best regards,
-- Al
I've actually didn't pay attention to the OP's request for LOVE song(perhaps due to the assumption that best songs are about LOVE), but nevertheless, I get stalled when hear Sade's Haunt Me.
Wow this thread has been alive for along time, since before the creation of Youtube. I digress...

Operatic love song goes to Una furtiva lagrima, from Donazetti's opera L'Elisir d'Amore. The elixir of love. Here is Ramon Vargas singing it with subtitles.

YouTube cannot do it justice, but you get the idea...
"Here and Now" Luther Vandross. And of course "In my Life" and "Glory of Love".
"Heard It In A Love Song" Marshall Tucker Band