This is a little subjective entry, so don't complain!
1. United Kingdom
The creators of heavy metal, the original country. Metal started in the UK, and from the NWOBHM movement came the subgenres.
Notable genres: heavy metal (classic), nwobhm, doom metal, speed metal, thrash metal, black metal
Noteable bands: Black Sabbath, Judas Priest, Budgie, Rainbow, Heaven & Hell, UFO, Iron Maiden, Saxon, Diamond Head, Motörhead, Tygers Of Pan-Tang, Jaguar, Avenger, Angel Witch, Witchfinder General, Venom, Wrathchild, Whitesnake
Creators of many original classic metal bands in the 70's and 80's and also responsible for the development and forming of teutonic thrash and euro power metal.
Noteable genres: heavy metal (classic), power metal, speed metal, thrash metal, industrial metal, melodic metal, melodic hard rock