My depth in Spanish music is not great, but there's a lot great pop romance that's been produced. Most of these are probably tired songs for the people who have lived with them all the time. I still like them though.
Vivo por ella by Andrea Bocelli sounds great in both Italian and Spanish. Look for duets with Laura Pausini, Marta Sanchez and Sarah Brightman. All good, although I don't know if there's a video in Spanish with Sarah Brightman.
Te amo by Franco de Vita
Porque sera by Rudy La Scala
Cuando se acaba el amor by Guillermo Davila
Yo necesito mas de ti by Guillermo Davila
Y como es el by Jose Luis Perales (more sad than romantic)
I could keep going. All of these and others have
very good memories.
It would be nice to see if anybody responds with some hidden gems that I haven't heard before.