I've been listening to the first six albums to get myself in the mood and what struck me, in addition to just how many amazing riffs there are, was just how many tempo changes they are also - every track seems to have sections at at least three speeds, which belies their doom heavy reputation somewhat.
I'm also currently reading Mick Wall's 'Symptom Of The Universe' bio of them. One of the most interesting elements was just how quickly they went from a jobbing blues band in the shithole venues of Birmingham to international mega stardom, literally in the period of about 12 months. The 70s eh?
Ozzy solo in 1991 was one of the first gigs I ever went to. It was eye openingly batshit crazy and super loud. Ozzy had his top off and rocked out like a madman throughout, only pausing periodically to mop himself down with a neverending supply of towels that he would then dispatch into the crowd. Being in the front row, I got hit in the face with one of said very damp towels midway through his set. I never washed that face again