Here's my favorite.
I also like Crazy Train, Hellraiser, No More Tears, Bark at the Moon, and Mr. Crowley.
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Crazy Train, Suicide Solution, Mr. Crowley, I Don't Know, Diary of a Madman, Bark at the Moon, No More Tears, Perry Mason, and if we're including his work with Black Sabbath, War Pigs and Iron Man. Can't really pick a single favorite.