Your Top 10 Metal Albums of All-Time

I know it's been discussed to death here, but what Black Sabbath played in 1970 was a genre known as "Heavy Blues," that is blues rock that falls into the realm of Heavy Rock. Just like there's Heavy Metal and Heavy Psych, Heavy Blues (early Sabbath) derived out of the heavier psych/blues rock scene of the late 60s.

Heavy Rock, imo, is an umbrella term that categorizes these heavier psych/blues rock derivatives.

Heavy Blues, Heavy Psych, Traditional Heavy Metal, Hard Rock, Acid Rock, Traditional Doom Metal, Speed Metal, and later on Stoner Rock and Stoner Doom are what would make up the distinct but related Heavy Rock styles. Traditional Heavy Metal would evolve throughout the early to mid 1980s, with the help of Punk Rock/Hardcore Punk, to distance itself from Rock via The NWoBHM, Speed Metal, and Thrash Metal, culminating in the development of the "modern metal" styles in the early 90s, with the help of Alternative Rock and more Hardcore Punk, such as Groove Metal and Black Metal, respectively, which would see the "Metal" umbrella as a distinct genre from Rock. Therefore, the majority of early metal releases in the 70s and 80s should be considered a form of Rock, as well. However, I would not consider Black Sabbath's eponymous debut to be a metal album, aside from the eponymous first track which is solid Traditional Doom Metal territory.