Thanks Carl, I see it.

It took me awhile to find some actual music files in that directory structure because many directories are empty.

It appears to me that the design is to use the file directory structure as some form of hash table, but I don't see why it's so sparsely populated. When I have more time, I may explore it more.

Thanks for the help.

Main System: MD600 & Sonos Connect -> 818v2 -> DSP5200SE+DSW SUB
Alternate Main System: Sonos Connect AMP -> Dynaudio Contour 1.3 SE speakers + Sonos SUB
Kitchen: Sonos Play:1
Bathroom: Sonos Play:1
Bedroom: Sonos Play:3