Progressive rock was big in the early '70s--and one can name many bands, such as Jethro Tull, Genesis, King Crimson, lots of them British, indeed. Where does Sorrenti fit? In the very Italian and distinct flavor of progressive music. By this I mean that the listener gets the brain workout associated with progressive music and some more, Bel Canto, that is. Aphrodite's Child comes close--there you have Vangelis and Demis Russos.
Sorrenti's voice and relatively sparse instrumental accompaniment are remarkable in how much they accomplish, which is nothing short of mind travel.
If you've only now come to (like) this music, I suggest you look up the Italian progressive bands active in the 1st half of the 1970s (in the 2nd half, they lost it). In addition to what you can find on Wikipedia, I'd also recommend: Panna Fredda, Delirium, and another album by Sorrenti: Aria.
P.S. No, I don't understand most Italian words either. From the experience with the British progressive music, the lyrics are probably something to enjoy just as much as the music.