Originally Posted by LeCoq

Yes and no..

The ozzy years with Sabbath were from 70 to 79. Most people refer to Sabbath from that original lineup. Before that, they were a blues band called Earth. In 70, they released their first record called Black Sabbath and last ozzy album is never Say Die released in 79.

In 80, they released the first Dio record and I have to say it was also a good album.

PS: all this to say that yes, the 70s is the decade of Rock genius.