Currently Being ModeratedNov 30, 2012 5:30 PM (in response to gabs1117)
Are you trying to copy all of your music to your new computer? If so, all you have to do is select all of your music. (command + A) and Import.
If you want to copy the ones not in your new library, just click the All Items button on the left and switch to All items not in my library" and Import.