IMO Black Sabbath debut album has only two songs that I would label as metal: title-song (maybe the first metal song ever) and The Wizard. I don't consider other tracks as Behind the Wall of Sleep, N.I.B., Evil Woman/Strange World, Sleeping Village and Warning to be metal at all. Most of these tunes are far too bluesy to be metal to me. Sabbath second album Paranoid is much more metal than the debut.
When it comes to Sabbath Bloody Sabbath, half of the 8 tracks on the album have nothing to do with metal: Fluff, Spiral Architect, Who Are You and Looking for Today. While SBS has some heavy moments(title track and Killing Yourself to Live), it was a very mellow Sabbath album compared to the previous three albums. That album sounds very sophisticated, unique and it incorporates many diverse music elements to be labeled as plain heavy metal.
Your thoughts?