well its impossible to imclude all the bands that everybody wants, but you really must include children of bodom
also . . . manowar really should be in power metal . . . and i have no idea where king diamond should go but its certainly not in "heavy metal" . . . i think thrash would be a better choice . . . or at least put mercyful fate in thrash.
speaking of thrash . . . iced earth is most definitely not power metal, they are thrash
just some suggestions
"I only got the sunny hours, the brightest hours of day
I never count the gloomy hours, I let them slip away"
-Long Beach Dub Allstars