Sexo por compasión

I watched the movie as part of a Spanish study project. I am fairly new to foreign films in general and am fascinated by the different cultural ideas that come through. In this film, the story was very simple on one hand but on another level - greatly complex. Seeing the comedy of another culture other than the one I was raised in is possibly one of the most educational ways to understand that culture. I throughly enjoyed the movie and don't feel that I can improve on the improve upon the already great comments posted here, but...... I do have a question about the soundtrack? I am haunted by the song sung during the closing credits - its beautiful and the singer has a wonderful voice. Does anyone know who sings the song (and the title) which is on the closing credits. I've poured over all of the credits a dozen times and searched the musical composers, and a number of the other names, but can't find the song or artist. I don't think she was credited, but my Spanish is not good enough yet to know for sure. If anyone knows the artist or song, I'd greatly appreciate a comment.