Paranoid has 'Iron Man,' 'War Pigs,' and one of the most recognizable riffs in heavy metal.

Paranoid carries several of Black Sabbath’s defining songs: ‘Iron Man,’ ‘War Pigs,’ and the title track ‘Paranoid’ — the band’s only top-20 hit, reaching number four on the UK Singles Chart. The ‘Iron Man’ riff alone is probably the most famous guitar riff in metal.