It looks cool, but I'm worried about readability on the phone. The text in some of those menu bars and notifications really blended in with the wallpaper in a few of those screenshots.
IMO it should "opaque up" the glass stuff when the blur detects significant similarity between the text / icon content on top, vs the blurred background on bottom.
Are there any recordings of the same piece played with a Stradivarius compared to a "regular" instrument? I have always wondered what makes their sound unique.