Squirrel Nut Zippers SQUIRREL NUT ZIPPERS COURTESY / PHOTO Jimbo Mathis isn’t from New Orleans. But the Squirrel Nut Zippers sure sound like they inhabit Crescent City on their current album, “The Lost Songs of Doc Souchon.” “Most of my band is from there,” the Zippers founder said from his Oxford, Mississippi, home. “It’s been