Please feel free to come with some examples if I've forgotten some good men!
Here are some good examples:
Ronnie James Dio - Dio, Heaven & Hell, Black Sabbath, Elf, Rainbow.
R.I.P. 16.05.2010
http://scrapetv.com/News/News%20Pages/Entertainment/images-3/ronnie-james-dio.jpg
Ronnie James Dio was an all-star. An icon, a multi-instrumentalist and generally a magnificent singer. Ronnie was 160 cm tall, and looked like a gnomy little elf, but he had the voice of an angel. One of the grandfathers and pioneers of the Heavy Metal genre, and a rock icon! He influenced thousands of bands with his enormous voice and his warm personality. All hail the little man with the huge voice!
Lemmy Kilmister - Motörhead, Hawkwind.
http://www.mountcarmelschool.net/student-websites/asmwebsite/images/lemmy_motorhead.jpg
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Steven Tyler