Since the IOS6 update the songs on my ipod won't play..

Try:

- Reset the iOS device. Nothing will be lost

Reset iOS device: Hold down the On/Off button and the Home button at the same time for at

least ten seconds, until the Apple logo appears.

- Unsync all music and resync

- Reset all settings

Go to Settings > General > Reset and tap Reset All Settings.

All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.

- Restore from backup. See:

iOS: How to back up

- Restore to factory settings/new iOS device.

were they purchased with itunes and did you sync them over with itunes? sometimes when restoring from backup if the songs are no longer available in the itunes store, you will not be able to play them.