Deleting song from iPhone 5?

Help! Normally you can slide your finger across and a red button that says delete will appear. This button appears on all my other songs except for this one which I accidentally hit sync from my iPod which I don't want anymore. It seems like you can only delete a song that was purchased off that device which this song was not.

If anyone knows how to delete this song please help

Check settings for the IOS version be ing used and post version.