What composition do you believe to be the most passionately romantic?

A few that I feel are very romantic:

Classical:
Sibelius Symphony #2 IV Movement
Brahms: Cello Sonata No.1 (I think. I haven't gotten to listen to this for a while.)
Ravel: String Quartet (I can't remember the number at the moment.)

I'm sure there are more, but I can';t think of them right now.

Non-Classical (In no particular order.)
Guettel: The Light in the Piazza
Guettel: Il Mondo Era Vuoto
Sondheim: Poor Thing
Sondheim: Johanna
Guettel: How Glory Goes
Sondheim: Anyone Can Whistle
Schwartz: Defying Gravity
Bernstein: I Had A Love (or is it Your Love is Your Love?)

I tend to be moved by program music a bit more than absolute music on most occasions. If an absolute piece moves me like good program music does, I know it's breathtaking.

Actually, I've found a new one

Although it's not too romantic, it still brings a tear to my eye for its potency.

Aaron Copland's Lincoln Portrait

Non-Classical (In no particular order.)
Guettel: The Light in the Piazza
Guettel: Il Mondo Era Vuoto
Sondheim: Poor Thing
Sondheim: Johanna
Guettel: How Glory Goes
Sondheim: Anyone Can Whistle
Schwartz: Defying Gravity
Bernstein: I Had A Love (or is it Your Love is Your Love?)

Umm, can you be my new best friend, Calehay? I love everything on that list, save I Had A Love, because I haven't heard it (yet!). Have you heard Myths and Hymns? Children of the Heavenly King almost makes me cry. But the most amazingly, startlingly beautiful and passionate music I've ever heard was in art song by Ricky Ian Gordon based on Langston Hughes' "The Dream Keeper", sung by the amazing Audra McDonald. A close second would be the Michael Starobin's beautiful underscoring in Sondheim's Sunday in the Park With George directly after "We Do Not Belong Together", which is really the most romantic.

As far as actual classical music, I'm far too poorly educated in that subject to make a remotely intelligent response, though I am awfully stirred by the little Rachmaninoff I've heard.

Sorry, have a doubt. Does it still counts if the music gives me all those weird feelings you mencioned () but isn't exactly extremely romantic and passionate? Thank you

Berlioz's Symphonie Fantastique, 2nd Movement - "Un Bal", the ending sequence (from the descending A Major scale to the end) makes me feel wonderful, like if you were dancing a neverending waltz with someone special. It's impossible to describe the sensation...