Black Sabbath are the band that started it all. Over the last 40 years, they have released 19 studio albums, which is a lot of material for any fan to digest. Of course, we have the staple songs that will never leave any playlist and can be played on repeat until the end of time without ever sounding overplayed. There's 'War Pigs,' 'Iron Man,' 'Black Sabbath,' 'Children of the Grave, 'Neon Knights,' 'Heaven and Hell,' and the list goes on and on. But what about the hidden gems and albums that don't get their time in the spotlight?