I'm talking about songs by the same artist.

But I don't want to waste diskspace, so I don't want to have the same file
many times over. Like you say, that's redundant and a waste of space.

But I would still like that song displayed under many albums and not just
one of them.

For example:

The song Dead Ringer For Love is both to be found on a Cher CD and a Meat
Loaf CD. So, I want it to be shown both when I (if that should ever happen),
click on the Cher CD and on the Meat Loaf CD.

As it is now its only displayed on the Meat Loaf CD, so when I click the
Cher CD its not there. Of course, there can be multiple contributing artist,
so if I click on Cher as an artists, its there.

But I want the same song to be shown on many albums, without having to save
multiple copies of the same song.

But how?