Powerwolf is a power metal/heavy metal band, formed by the brothers Charles Greywolf and Matthew Greywolf in Germany. The band spent a lot of time doing nothing until they met up with a Romanian vocalist called Attila Dorn. Attila Dorn came from a classical background, when he met up with the Greywolf brothers he expressed an interest in metal and followed them back to Germany which is when Powerwolf took off.
They are signed to Metal Blade Records whom expressed an interest when they heard a German group was working with a Romanian classical singer to create a metal group.
The band furthers the combination of classic heavy metal bands and adds a unique touch to the music. Imagine King Diamond's atmosphere and keyboards combined with Dio's catchiness and you're about halfway there.