Heavy Metal is an Anti-Christian style of music that began to develop between 1969 and 1974 from Psychedelic and Blues Rock and Classical music. The aural aspects of metal generally revolve around highly-amplified guitar distortion, heavy bass lines, fast and melodic guitar leads and varying styles of vocals ranging from operatic to guttural.
Many bands create giant props of Satan for their concerts accompanied with flames and fireworks in order to recreate the conditions of Hell. Metal songs that promote Satanism include "By Demons Be Driven" by Pantera,   and "The Conjuring" by Megadeth.  Bands such as Mudvayne even heavily alter their appearance so that they physically resemble Satan himself.
The "Devil-Horns" hand signal is a common gesture made in metal culture. This is done by placing your ring, and middle finger together along with your thumb and then raising your index and pinky fingers. This is done to look like the horns of Satan.
Denial of Satanism
Some individuals become so immersed in the Heavy Metal culture that the vehemently deny the obvious correlation between Heavy Metal and Satanism.
Anti-Christian sentiments are quite common amongst the extreme metal sub genres, especially in the Scandanavian black metal scene. Metal bands that claim to be Christian are criticized for making Un-Christian sounding music, or faking Christianity to sell records or corrupt young Christians. Supporters of Christian metal often deny the inherently violent natures of heavy metal music and overlook the fact that Jesus would not want Christians to channel these negative emotions.
Suicide and Violence
Besides Satanic criticism, Heavy Metal music has been known to promote violence, sex and suicide among youths. Glamorization of suicide can be observed in songs such as "Suicide Solution" by Ozzy Osbourne  and "Fade to Black" by Metallica,  while violence is promoted in songs like "Take No Prisoners" by Megadeth  and "Die by the Sword" by Slayer. Metal songs with violent lyrics have shown to lead to an increase of the amount of violent thoughts and actions within the listener. Riots after Heavy Metal concerts are a regular, expected occurence.
The following are sub genres of heavy metal:
Heavy Metal Bands
The following artists are considered to be heavy metal: