When rising zydeco star Ruben Moreno opens the Louisiana Cajun-Zydeco Festival on the morning of Sunday, June 7, it will become evident how zydeco continues to advance its cultural horizons from its paradigm. Moreno isn’t the typical Louisiana-weaned Creole—nor is he from the Cajun heritage-playing zydeco tradition like Horace Trahan and Travis Matte—but instead grew up in Houston’s second ward, a.k.a. “Segundo Barrio,” a predominantly Mexican-American neighborhood. Though his grandfather was...