At 130 pages, the fourth and final volume on the legendary Ivan "Melon" Lewis is also the longest and most extensive, continuing the survey of his tumbaos and also including three full transcriptions and in-depth analyses of his playing style on introductions, cuerpos, fixed montuno sections, mambos and other parts of the arrangement. It also uses Issac Delgado's never-released live masterpiece La tematica to launch our most in-depth study of the art of "controlled improvisation.""