Thanks for the comments. I'm going to create a folder for each artist and then a sub-folder for each album with the tracks inside. Seems to be the easiest to deal with. I also took Larryski2's advice and called Sonos support... nice people. They felt either approach would work with their software.
The other thought is to not use too many sub-folders. The deeper you go, the longer the path name becomes and it's easy to hit the limit, somewhere around 260 characters.
The other thought is to not use too many sub-folders. The deeper you go, the longer the path name becomes and it's easy to hit the limit, somewhere around 260 characters.