response: Ha.  Looks can be decieving.  In 1968 three major metal bands formed:  Black Sabbath, Deep Purple, and Led Zeppelin.
history: I have a new girlfriend who's really into heavy metal music, so I need a quick crash course. Good bands, brief history, that kind of thing. OK, well heavy metal, also known as just metal, began in the 1960s and 70s in the United Kingdom How is that possible? People from the UK just seem so...harmless!
knowledge: In 1968, three of the genre's most famous acts, Led Zeppelin, Black Sabbath and Deep Purple were founded.