The piece that gives its title to the album, Natura renovatur ("Nature is renewed"), was written in 1967 for 11 string instruments. Here it is:
Please listen to it and form your own impressions before I offer mine!
Scelsi is highly renowned for supposedly discovering a new way of composing. He did everything through improvisation, which was then transcribed. The inspiration for Scelsi to change his way of approaching music was Eastern spiritual thought. I think that puts him squarely in a certain tradition in the West, one shared by other composers and artists. There is nothing wrong with influences, of course, but I get the sense, from the music and what he seems to have thought about it, that it is a kind of escape from the traditions of composition in the West. Like Buddhist meditation, to which this is perhaps related, it is about extinguishing thought and the ego and becoming a mere receiver for whatever forces you sense in the void. This is, in my opinion, a very bad idea! Well, it's not an idea as such, but it is certainly a practice! Let's not flee into Oriental quietism and stasis and think we have achieved something, shall we?
As for the music, it very much reminds me of John Luther Adams without the lush orchestration and charm. And this may be where his music derived some ideas.
UPDATE: I forgot to include this. As part of his flight from, well, existence, I suppose, he avoided having photos taken of him for much of his life. He preferred to use this as an icon/monogram: