Ive been wondering, what is generally accepted as the first true metal music album ever made? I have read that most consider Black Sabbath - Black Sabbath to be the first one, which is understandable but others say that more 'hippie' albums like Blue Cheer - Outsideinside or even Led Zeppelin - Led Zeppelin to be it. Does any one know what the first one would be or is it really just a matter of opinion?
Any help will be apprecited.
I didn't find the right solution from the Internet.
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