thanks for your reply, that fully answers what I wanted to know.
The first (subdirectories) obviously was too simple for me to find it. If 'NO SUBDIRs' wanted, I always moved the files into a temporarily new created directory HUGO, modified them there and moved them back - that definitely could not be 'working as designed' Now I know !
The second opens almost a fully new dimension of mp3tag to me, that's perfect.
Now I have to consider how to make the most use of this feature. I put all information into the filenames and 1by1 works with that (and I will continue to do so !), but in times of streaming I want to be prepared with my collection for tag-based systems.
One additional question:
the subdirectory of a symphony is named (strictly)
composer opus-nr opus-name conductor orchestra
With a 3-letter-code for each orchestra worlwide (COOL, e.g. ASMIF for Academy of St.Martin in the Fields)
The files in the subdir are named (strictly)
composer opus-nr opus-name movement-nr movement-name-or-tempo
When I search with 1by1 for a specific conductor, it will bring all the mp3-files which themselves do not contain the conductor's-name, but are in the subdir below. Perfect. Does this work with tags ?
After having written this I know the answer: Of course it works because the conductor's-name is in the tags of each mp3-file.
This means much work for me - but if the direction is good, the speed is secondary.
Additional question, if I may:
Which tags would you recommend to use ? There is no real IP3v1 tag COMPOSER (therefore it's usually under INTERPRET) so I include it into ALBUM. Now I consider of putting into GENRE things as ouverture, march, funeral, wedding, Allegro, Adagio, cantabile and stuff like that. Should I do so or just have GENRE=Classical ? Not very informative. Which tag are easily intrpreted by most of the mp3-players ?
Thanks again, that was of much help for me.