its a fine line between 60's 70's and 80' but ill have to say the 60's because with black sabbath coming in the late 60's i really began to get into them a lot when i wanted to look back on some of the old rock. and it also led me to ozzy osbourne which i love even more. a band leading to another band is a good thing for me.
sad how ozzy was replaced with Ronnie James Dio. and with the new stuff Ozzy has put out, he's starting to lose a rock edge a little bit. =(