Beets can organize your music library. It uses musicbrainz IDs to identify songs and albums, it can move/copy the files into folders. You can also convert files right away. I created additional mp3 files and moved Thema into a separate folder for use on my phone to save space.

There are plugins to normalize the volume. Loads of dstuff. You just have to set up a config file to your needs and you are good to go.