Why have i lost all imported CDs from my iTunes Library
I have lost all my imported CDs and all Playlists from my iTunes library painstakingly compiled over years of effort. Over 110GB of music disappeared overnight when I upgraded software at the end of 2015. How can I get these back without starting the entire process over again? The only thing remaining in my Library is the Purchased Playlist. Can anyone help, please? Thank you.
iPod classic 160GB (Late 2009), iOS 9.2.1, iPad2, iPhone6, laptop Windows10