ZITAT(mhuusko @ Aug 1 2012, 09:06)

I have the structure of Artist/Album/track-Title in the folders.
Is that a good starting point for automatically getting the rest?
rgds,
Markku
Depends. If you have really nothing in the tags then you can use the converter
Filename-Tag.
You have to enter a mask to tell MP3tag where to put which data. If your path description is correct, then a mask like this should work:
%artist%\%album%%track%-%title%
If you want to leave out certain data then replace the field variable with the variable %dummy%. E.g. if you have already filled TITLE then the mask could look like this:
%artist%\%album%%track%-%dummy%
The dialogue has a preview so that you can see which data will end up in which field. If you see garbage there, then have a look at the real sequence of data: every blank and hyphen counts.
Modify the mask until it is right.