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.
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.