Oh wow. When i saw perdonamé, i thought it was the one by Camilo Sesto Blanes. Have you heard it? I'm not good with Spanish unfortunately. It goes like...
Amemonos de nuevo como antes...y olvidarte, olvidarte, que nada volvera, a las ti marte...
Lol. Forgive me I have zero Spanish knowledge...😩
You are right, the best known song perdóname in Spanish is that of the Spanish singer Camilo Sesto, curiously the song I sing this time is "All by myself" by erick Carmen and that also covered by Celine Dion...