For the solo I just play lots of repeating riffs in D - that`s a fair approximation to the Tony Iommi lead. I wouldn`t try to copy it exactly; I couldn`t do it justice, and I`m not into learning solos note for note anyway.
As for the key, I learnt to play it in in Db (my guitar was tuned way sharp for some reason), I think it should be in D, but our bass player wants to play it in E. Its a magic song which sounds good in any key :-)
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