I downloaded it when it was first release.

Then I went and bought a physical copy of Songs Of Innocence for the bonus CD. I always ripped every CD I bought into apple lossless and store in on my portable hard-drive and all those music files on the harddrive is displayed in itunes library

What happen was that both the itunes download and the physical copy download appeared in my library. When I deleted the itunes version. The Songs Of Innocence itunes version remained on the library with the icloud logo next to it waiting for me to double click on it and redownload the album.

So when I search for U2 songs of innocence. I ended up getting a duplicate of hte physical copy version and the icloud itunes version of the album appearing and it was impossible to remove the icloud link from the program itself

I quickly used the U2 Songs Of Innocence remover on the apple website to remove it from the library