iTunes not showing all my music?

[JonasFalslev]

Hey guys,
I hope you have a solution for this problem. I have recently installed a new SSD hard drive in my MacBook Pro, before I did this I copied my entire iTunes library (20 GB). After the install I copied the same library to the music folder, the folder still shows 20 GB.
Now the strange thing, when I open iTunes my entire music library shows only 16 GB.

What have i done wrong :S

 

[Dane D.]

Look at the bottom of iTunes and see if the number of songs changed. You can't tell by how much space the library takes up.

 

[JonasFalslev]

Sorry if my entry post was a bit confusing. In iTunes it only shows 16 GB of music