It tends to be disputed to some extent, but 1970 - the year of Black Sabbath's first release - is the most common answer.
To make awesome heavy metal music
Birmingham, England -the home of Black Sabbath.
yes, the heavy plow was invented in the year 600 during the middle ages!
1968.
Iron Maiden have always been a heavy metal band since they began in 1975
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The "Devil Horns" were invented in Heavy Metal by Ronnie James Dio, Hope this info has helped, Stay Brutal \m/ Agreed, although he didn't exactly "invent" it, he simply recreated it as a Heavy Metal and Hard Rock thing.
Heavy Metal was originally coming from Rock. Because Rock isn't that hard like Heavy Metal and Heavy Metal was invented, it shows the difference between both music genres. Heavy Metal must have hard beats as same as country music needs accustic guitars and heartbroken lyrics. Same as techno needs infinite amounts of the same beats with few breaks, but the rythm is the same all the time in a loop.
Ozzy Osbourne is a metal vocalist. He was in the band Black Sabbath, who invented heavy metal, and since then has continued being metal. In Sabbath his stuff was more like doom metal, but his solo work is traditional metal.
Nu-metal, heavy metal, alternative metal, groove metal.
Heavy Metal with Christian imagery and lyrics.
The Production Budget for Heavy Metal was $9,300,000.