Oh boy this was tough. So many great bands have come from Germany. The country has also been at the forefront of the development of the metal genre in general with the 1970's emergence of Scorpions. Several major scenes have erupted out of Germany. Of course Germany is also interesting because my last name is German.
So, ultimately I have to choose just one band. That band is Sodom. Sodom is the only German metal band that has been extremely consistent throughout their entire career. Sodom of course was one of the Big 3 of German thrash and was hugely influential on the development of the black and death metal scenes with their earliest work as well. Their raw and brutal style was another starting point in the inception of black metal. Despite all this, it is their pure thrash metal albums that are the most impressive. They have crafted some of the greatest thrash metal albums of the 1980's. And their consistently fine work places them above the other two bands in the Big 3.
NOTABLE SCENES: Germany's thrash metal scene is terrific. Many pioneering power metal bands rose from Germany.