Kai Michael Hansen (born 17 January 1963) is a German musician who is the founder, lead guitarist and vocalist of power metal band Gamma Ray. He is also one of the co-founders of metal band Helloween, which he rejoined in 2016. He is a prominent figure in power metal and has sold millions of albums worldwide. He is regarded as "the godfather of power metal", having founded two seminal bands in the genre. In 2011, he joined the band Unisonic featuring former Helloween vocalist Michael Kiske. Hansen and Kiske reunited with Helloween in 2017 for a world tour with all current members, celebrating the 30-year anniversary of release of the albums Keeper of the Seven Keys Parts I and II.
Kai Hansen was born in Hamburg in 1963. At the age of ten, Kai got interested in music and started playing wash-drums. His parents however, didn't like the noise and bought him an acoustic guitar instead. He took a six-months course in classical guitar and following it, formed his first band with his classmates after he bought an electric guitar, a white Ibanez Les Paul.
Hansen's musical career started in 1978 in a band called Gentry, alongside Iron Savior's co-founder and producer Piet Sielck. In 1983, he and Michael Weikath founded Helloween, where he was guitarist and singer until Michael Kiske took over the microphone for the albums Keeper of the Seven Keys: Part I and Keeper of the Seven Keys: Part II. Hansen left the band due to the extensive touring in 1988–89 and went on to form his own power metal band Gamma Ray. Hansen also joined Iron Savior as guitarist in 1997, but quit after a few years to focus his efforts on Gamma Ray. He has now forged a very successful career with Gamma Ray, releasing several albums and playing sold-out tours across the globe.

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