I was looking for a PowerShell script that would remove all media tags (post coming) from a folder of music that I have and along the way I came across a blog post called PowerShell - Automatically organizing your mp3-collection. Although this wasn't exactly what I was looking for right now I gave it a try and then thought to share it after I made a couple of changes to make it work on my machine and categorize a bit more . You can grab the script off GitHub Gist organise-music.ps1.
Basically the script will take any structure of music and organize it into the structure below
%root% / %Album Artist%
%root%/ %Album Artist% / %Album Year%
%root%/ %Album Artist% / %Album Year%/ %Album Name%
You also don't need to have all your files in a single folder for this to work, it will recursively find matching file extensions ("*.m4a", "*.m4b", "*.mp3", "*.mp4", "*.wma", "*.flc") and then work out where each file should be placed, creating directories where needed and cleaning up empty directories and extra files when finished