I was really into Black Sabbath, but heavy guitars can really be very limiting, it's a great frequency and it's great fun to listen to but on the other hand, musically you can do a lot more without it. ↗
Pamphlets on Sabbath writing are in request here I have been applied to for them by several of the old Methodists knowing that I had them to sell before. ↗
I still think the best metal bands have a blues feel. The first Black Sabbath album is kind of a bludgeoning of blues. Deep Purple also started out as a blues band. ↗