Thanks Altnikol for the pointer.
The main theme sets a strange atmosphere, similar to that of Gli indifferenti. The end title is a very poignant melody, reminiscent of Andrea Bocelli's Come un fiume tu. A stunning effect is obtained on the version of it where a man's voice is singing (moaning?) words in, I think, Neapolitan language (see part 5 on youtube http://www.youtube.com/watch?v=mcxPZXQKoRc
, after 12 minutes).
One of the other pieces was already heard in Filumena Marturano, with a melody similar to the Tema di Francesca from La moglie più bella. But here it is heard fully with no dialogue.
All in all, I'd say it's an interesting score. Morricone succeeds in creating something different, even though there are many hints at his past works.