What singer ever did six back to back albums better?

Yep, I've questioned some metalheads and gave my personal N1 - Ronnie James Dio!

Some feedbacks:
Pretty much everyone. How good or bad something is subjective. Just because you like it that doesn't mean it's good and just because you don't like it that doesn't mean it's bad. Some may say the've never been a big Dio fan with all the dragon's and fantasy and stuff but they admit that Dio could sing his ass off. Has anybody else effortlessly went from doo-wop to folk to classic rock to heavy metal with such precision and grace in every way like Dio? Took everything but music in school but mastered it with the skill of any of the greats. How about has any singer been so massively successful in so many bands with so many different players like Dio? Plant is garbage without Page, Halford not nearly as successful without Glen or K.K. Ozzy had Zakk for far longer than Dio had any one member.

Some suggestions from the followers:
1. ROBERT PLANT
2.  Sammy Hagar... Montrose, Paper Money, Nine On A Ten Scale, Sammy Hagar, Musical Chairs, Street Machine, Danger Zone, Standing Hampton, Three Lock Box, VOA, 5150, I Never Said Goodbye, OU812, FUCK, Balance, Marching To Mars
3. Steven Tyler
4. Ozzy

and many more!