Hi PostalComa,
Try playing the songs on your PC...if they play on the PC...then remove the songs from your device, then re-sync them. That should fix the problem.
If they don't play on your PC, you'll need to contact customer support...there's something else weird going on. Customer Support contact information can be found by following the link below.
http://www.zune.net/en-US/support/contactsupport.htm
Toffer Davidson Zune Product Team .: This posting is provided "as-is" with no warranties, and confers no rights :.