"To Get Me To You" by Lila McCann (sp?)--it's on the "Hope Floats" soundtrack
It was my "I'm-holding-out-hope" song when I was single! (-; And another reason I love it so much is because last Valentine's Day, my husband (knowing how much I love the song) surprised me with a slow-dance to it, in our very own living room! It was so sweet & romantic, I just cried. So now it has a good memory attached, too!
I know you said one song, but I'm such an indecisive person. I would add more to the list but i really have to hit the sack.
Wild Horses, Rolling Stones
Fade Into You, Mazzy Star
In Your Eyes, Peter Gabriel
From This Moment On, Shania Twain (Our Wedding Song)
Landslide, Fleetwood Mac
Why, Annie Lenox
Somewhere Over the Rainbow, That Hawaiin slack-key version
My long-term favorite is 'Lady in Red'
Then there's 'I cross my heart' by George Strait (DH sang it to me when he proposed)
'Who Let the Dogs Out' and 'Hey Yeah' are guaranteed to get me dancing around like a crazy woman
Favorite for the week is 'My Immortal' by Evanesance
Oh! And my favorite for singing karaoke is 'Ballroom Blitz' by Sweet