Black Sabbath - Paranoid
Metallica - Master of Puppets
Pantera - Cowboys from Hell
Iron Maiden - The Number of the Beast
Dio - Holy Diver
Then after that
And then after that for exploring genres:
Modern:
SOAD - Toxicity
Metal core:
Killswitch Engage - The End of Heartache
Progressive Metal:
Dream Theatre - Images and Words
Classic Death Metal:
Death - Scream Bloody Gore
More Extreme but a must:
Meshuggah - 1. Destroy Erase Improve
2. Obzen
Modern Death Metal:
Gojira (Technical and Progressive) - From Mars to Sirius
IMO the best metal band (according to my mate)
dio so real