From the publisher:
Learn to identify the many tribes of the international heavy metal community, from Thrash to Black Metal. Master the codes, from the sign of the horns to the Diabolus In Musica. Understand how Satanic Metal coexists with Christian Metal. Discover genres that have spread outside the Western world, like Japanese and Iranian Metal. With so much more to uncover, your journey into Heavy Metal has just begun.
The Little Book of Knowledge series has everything you could want to know about your favorite subjects, all wrapped in a convenient and attractive hardcover graphic novel. Written by experts in the field and drawn by fans who know the material, each Little Book is perfect for the established enthusiast and burgeoning amateur alike.