Restoring my iTunes after clean install of El Capitan

I have my iTunes music stored on my Time Capsule due to space constraints on my MacBook Air. I did a clean install of El Capitan and am trying to restore my files. I thought all I would have to do is change the path in the iTunes preference to the Time Capsule but alas that didn't work. I then copied over all of the iTunes folders from my backup from yesterday thinking that would resolve the situation but the only music showing up in my library are my iTunes purchased songs (I have a large library of old music from CDs).

Can anyone help me? I would greatly appreciate any advice! Many thanks!!