Heavy metal is now over 40 years old. It emerged at the tail end of the 1960s in the work of bands including Iron Butterfly, Vanilla Fudge, Jimi Hendrix, Deep Purple, Led Zeppelin and - most importantly - Black Sabbath. In the 1970s and early 1980s, heavy metal crystallised as a genre as bands such as Judas Priest and Iron Maiden removed most of the blues influence on the genre, codifying a set of basic metal characteristics that endure to this day: distorted guitars, aggressive vocals, denim, leather and spikes. In broad terms, wherever it is found and however it is played, metal tends to be dominated by a distinctive commitment to 'transgressive' themes and musicality causing it to be frequently seen as controversial music. Controversies surrounding the alleged (and often documented) connection between heavy metal and, variously, sexual promiscuity, occultism and Satanism, subliminal messages, suicide and violence have all made heavy metal a target of moral panics over popular