There are a few tracks from Moulin Rouge soundtrack that are romantic albeit a little over the top.
You are the sunshine of my life- Stevie Wonder
Have I told you lately that I love you- Rod Stewart
Everlong- Foo Fighters
Can’t Smile without you- manilow
I belong to you- kravitz, lenny
Just the way you are- billy Joel
Now & forever, loving you forever – carole king
Friday Night- the darkness
Come by me, love is here to stay- Harry Connick, jr
Island in the sun- weezer
Did you ever look so nice?- the samples