What are you asking for, specifically? iTunes lets you organize music how you want on the filesystem, or you can let it organize the music for you. The only thing it doesn't do is present a view of the filesystem, but the Finder already has that.
But there is a standard for tagging audio data and iTunes uses it, just like any other half decent audio player / music management software. As long as your meta data is clean your library should present in a very consistent way between different players.
