Known as the "godfather" of the genre power metal
Started as a guitarist/vocalist in helloween
probably the most influencial euro power metal band. Unhappy with his vocal talents, helloween hired a new vocalist Michael Kiske...With his unbelievable voice Helloween were becoming a force to be reckoned with
Kai Hansen then left at the worst possible time , just after releasing the two greatest Helloween albums "Keeper of the seven key" Parts I + II ... Helloween were in their prime but without Kai Hansen
He then founded gamma ray
but started only as a guitarist. After the departure of Ralf Sheepers(vocals) Kai took on the position of vocals and guitar again , He also founded iron savior
another Power metal band with a very different vocalist in Piet Sielck.
Kai Hansen is still with gamma ray
and has worked with French Power Metal band Heavenly...Swedish band hammerfall
... power metal icons blind guardian
... and the project of tobias sammet avantasia
along with members from old band helloween and other greats from the power metal genre.