Hi Remesh,
Even if I read it a 100 times, I can't follow. Can you try in Dutch ?
I think it doesn't even matter, because Galleries are there a. to store one album from more angles and b. to always find back the album or artist from whatever angle, if you'd only know about the Search facility. Example (see first screenshot below); What's all in there ?
First off, see the Search Term at the bottom. This starts with a back slash (\) so I'm assured that this is an entry which starts with that Artist Name (it may make a difference when the Artist Name is in the middle).
At the bottom you see the C:\Galleries\ (which is not my OS disk, plus it is a fast SSD, especially there to be fast for the Gallery lookups).
Crucial is that all the Galleries I make, I make under one root : \Galleries\. Now all I have can be found under there, assumed that each and every album is put into at least one Gallery.
Then, you see in the first album a "Peter's Latest" entry. This is from a real PF album, "Watch the world up The Wall". But, we can already see "an" angle - my latest (at some moment in time). Similarly I now use a "Listen" Gallery. In there I put albums I run into by accident, and which I want to listen to sooner or later. When done, I remove it from there. And, might I really use the Peter's Latest (for the latest obtainments) then I'd remove it from there when I listened to it a first time.
Next you will notice that most are from the band members - not PF itself. But, I put them in a "Pink Floyd" Gallery so I have a complete collection of what all the members ever created (if I possess it of course).
Now for the crux, look at the second screenshot.
Look again what I entered in the Search Field with for this screenshot my emphasis to the "&amused" which selects Roger Waters and Amused (to Death). But it is not rally about that. You now see *and* my obtaining from the different angles in as well
\Rock\
\Rock-Sortout\
\Rock\Pink Floyd\
... which is about your Jazz 100. Btw also notice the 3 white WAV vs the two brown FLAC. But this is actually unrelated.
So ... what you now see additionally is the obtainment in \Nice Stuff\ as well as \Demo\, which both are derivatives from the version in (the WAV) \Rock\.
Remember, this is always looking in the main \Galleries\ Gallery. Never the original source. However, searching in a main (root etc.) folder in there would work just the same, but obviously from one at the time angle only, and not as fast (because it is obtained from the original source disk (which contains all the real data and is more slow)).
At the bottom a two screenshot bonus which is similar to your Jazz 100. The first shows a collection of the MP3 top 1000 and in the last screenshot for fun I tried whether there's a Pink Floyd in there. There is one.
Regards,
Peter