Had problems importing all of my music but was able to solve
This is more of a comment and as oppose to a question... I initially had problems importing all of my music on itunes but was able to solve this problem by importing them from icloud. These are the steps I used in doing so.
Go to itunes menu bar (top left) and select "Account" then "Authorizations" from the drop down menu --- followed by "Authorize this computer". At this point, will be asked to enter your Apple ID and password credentials, and to sign in. After signing, you will then have access to all of your music. Just download them all.