Your questions doesn't make much sense when I try to understand what you are trying to accomplish here.
Your title make reference to the Finder. I wouldn't suggest you bother too much about the Finder since iTunes will manage pretty efficienly the files to follow the information your enter in iTunes (ie. create folder per artist and per album title). This article pretty much explain it: http://support.apple.com/kb/ht3847
In your post you mention playlist vs iTunes. It doesn't make sense since your playlist ARE in iTunes. Playlist does not organize anything, they are more like shortcut to your songs that already are in iTunes.
If this does not answer your question, try to precise what you are trying to do.