Gamma Ray

From Lastfm:

Founded in 1989 by Kai Hansen in Hamburg, Germany after leaving Helloween, Gamma Ray borrowed straight from the Helloween classics, and continued to pioneer Hansen's style of power metal. After four years with Helloween, Kai Hansen decided to leave the band at the height of their career. He then went on to do some studio work with Blind Guardian. Kai and his friend Ralf Scheepers from Tyran' Pace decided to start a project. They recruited bassist Uwe Wessel and drummer Mathias Burchard. The resulting sound was very close to Helloween's power metal style.

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From Wikipedia:

Gamma Ray is a power metal band from northern Germany, founded and fronted by Kai Hansen after his departure from Helloween. Hansen is the current lead vocalist, guitarist as well as the chief songwriter. The band is known as one of the most prominent bands of the German heavy metal scene. Despite having many lineup changes in their early career, the band's lineup has remained stable since 1997.