One of the greatest bands ever to come out of Germany, all of their albums are great.
https://www.youtube.com/watch?v=795gDjnpZhM
https://www.youtube.com/watch?v=eJeDkeGTxjA&feature=related ----> One of the most headbang inducing chorusses ever, crazy powerfull and awesome stuff!!
https://www.youtube.com/watch?v=RJnA2cJxHFA&feature=related
Attention: The singer sings with a darker, gruffier, heavier voice than usual Power Metal bands.