Book excerpt: An in-depth history of rock and roll's Louisiana roots. Taking the position that rock and roll started in New Orleans in 1947 when Roy Brown recorded "Good Rockin' Tonight," Aswell provides an expansive history of this beloved American music form. By looking at the Louisianan influences of swamp pop, Cajun, zydeco, R&B, rockabilly, country, and blues music, the author explores the way these musical forms gave birth to rock and roll as we know it today.