Since you mentioned the /var directory, I’m gonna guess you’re running a *nix server of some kind. I use easytag for audiobooks and Picard for all my music that lidarr couldn’t figure out. You can match your lidarr and Picard renaming formats so that everything is organized consistently. I tend to leave compilations / soundtracks/ various artists albums in their own directory and leave any artist level grouping as a task best handled by a database tag filter in the player.