Songs not adding to iTunes library
I have just performed a clean install of High Sierra and am in the process of setting it all back up. Part of that process is re-adding my music to the iTunes library. For some reason, iTunes is only adding some songs and refusing others. These albums have been played in iTunes for the last 5 years and they are all mp3 format. Some albums are missing any number of songs, and other entire albums are missing. There is absolutely no reason for it. I have tried Add to Library, dragging and dropping and right clicking the song; nothing will work. Why is this happening and how can it be rectified?
Thanks for your help!
Milan
MacBook Pro (13-inch Mid 2012), OS X Yosemite (10.10), Mini Display Port to VGA