ehh... symlinks... perhaps, But I am talking about hardlinks.

Having said that, I will be the first to admit. the reason hardlinks are not often used is that it is a real "here be dragons" part of the map.

10 years ago I spent a couple fun weeks categorizing all my music. my schema was something along the lines of

every file was linked to

  artist/artist_name/song_name
  band/band_name/song_name
  song/song_name/band_name
  date/YYYY-MM-DD/song_name
  genre/genre_name/song_name
  playlist/playlist_name/index
  etc, etc

then I had fun making up a small set of cli utilities to find tags, create and manage playlists etc. then A. it turns out I don't really listen to music. and B. the whole structure wanted to explode every time I would try and move it to a new host. so it probably still sits there on one of my file servers but now as a million duplicated files.