The book researches a world and an art, like angelic music and sometimes surpasses the senses and the limits of human intelligence. It blends the orthodox theology about angels (and not only) with the art of celestial music. I have worked for this book for years and, at certain point, I thought I would never finish it. I have tried and I hope I succeeded in summarizing the wonderful perfume of angelic music, a music that prefigures a little part of the brilliance of the world we will go when God decide.