Book cover design for Salva Rubio, the author of the book “Extreme Metal: 30 Years of Darkness (1981-2011)” (Tm), a nearly 600 page volume with more than 1000 bands reviewed in more than 256,000 words, an in-depth analysis with a never-seen-before scope, covering history, musical form, aesthetics, evolution, lyrical themes & more, covering separately the 10 major styles of Extreme Metal.