Are we talking about romantic love here (if you like to distinguish ...)? There is no way I could pick just one. Here's a list.
I Still Believe (Miss Saigon)
All I Ask of You (Phantom of the Opera)
On My Own (Les Misérables -- does that count??)
Last Night of the World (Miss Saigon)
A Heart Full of Love (Les Misérables)
Sun and Moon (Miss Saigon)
As Long as You're Mine (Wicked)
Tell Me on a Sunday (Song and Dance)
In His Eyes (Jekyll & Hyde)
There's a Fine Fine Line (Avenue Q)
Coimhéad fearg fhear na foighde.