While Black Sabbath would master their craft on future albums like "Sabbath Bloody Sabbath" and "Sabotage," their self-titled debut is still a classic, and in my opinion, the real first heavy metal album. The title track, even 42 years after its release, still sounds dooming and bone-chilling. Other tracks like "NIB," "The Wizard," and "Wicked World" are fantastic slabs of early metal music.
I've had this album since August of 2002 and I still play it regularly.
Simply put, if you love Black Sabbath and want an important piece of heavy metal history, then this needs to be in your collection.