To most people, zydeco appears as quintessentially Louisiana as gumbo. Certainly, the music originated among black Creoles of southwest Louisiana. But the swamps of southwest Louisiana spill across the Sabine River into southeast Texas, and the music originally known as "la-la" quickly trickled west, too. There it fused with blues to create a new sound that came to be known, spelled, and recorded as "zydeco." Black Creoles from Louisiana...