Michael - Connecting a portable hard drive to the Mac and copying the files into a folder on the HD then connecting the HD to the PC should work. That would actually probably be better than trying to burn CD or DVD data disks since that many songs could take forever to burn. HOPE THIS HELPS.
Thanks to you all for the help!
Several very good suggestions here! I will start with the external HD option then go from there!
Be cautious. I lost a HD that was formatted for a Mac that we tried to load onto a Win 7 system, and the entire drive was scrambled.