I dont know I reckon PCM encoded music has a digital signature.  Its an image of the real thing.  I think based on the fact I work in software I'm very anti-digital when it comes to music and photography.  SACD is the thing that caught my attention and pursuaded me to bother.

Yep i didnt say Sony had no alterior motives, but they had to archive their back catalogue and DSD was a product of this effort.  The other motive was to build a giant high-resolution, audio space bat, to take the Sony CEO to the centre of the milky way, but I dont think thats documented in the public domain (yet).