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Tuning: E A D G B E
This is really played in B minor using power chords. Tony Iommi plays them all on the lowest two strings, starting at the 7th fret. But here are two beginners versions of the riff. [Version 1] (In E minor, single notes all on low E string) e|-------------------------|---------------------------| B|-------------------------|---------------------------| G|-------------------------|---------------------------| D|-------------------------|---------------------------| A|-------------------------|---------------------------| E|-0-----3-----3--5--5-----|-8-7-8-7-8--3--3--5--5-----|