Finder window doesn't see new music in iTunes

Now when I add new albums to iTunes, the Finder window simply does not see them; they do not appear in any of the lists under 'Music', 'iTunes' etc; they are invisible. Which is really annoying because it means I have no way of copying the music onto my tablet or my phone, as I can only copy things to my other devices using Android File Transfer.

Does anyone have any ideas as to why the Finder is no longer able to see music added to iTunes?

<Edited by Host>