Since its beginnings more than fifty years ago, metal music has grown in popularity worldwide, not only as a musical culture but increasingly as a recognised field of study. This Cambridge Companion reflects the maturing field of 'metal music studies' by introducing the music and its cultures, as well as recent research perspectives from disciplines ranging from musicology and music technology to religious studies, Classics, and Scandinavian and African studies. Topics covered include technology and practice, identity and culture, modern metal genres, and global metal, with reference to performers including Black Sabbath, Metallica and Amon Amarth. Designed for students and their teachers, contributions explore the various musical styles and cultures of metal, providing an informative introduction for those new to the field and an up-to-date resource for readers familiar with the academic metal literature.