Happy, happy birthday to the father of power metal, Kai Hansen! (helloweenofficial, Gamma Ray, Unisonic)! 🎃🎂🥳🎉 Thanks for all the bangers over the years. 🤘 #kaihansen #powermetal #helloween #gammaray #unisonic #happybirthday #happyhappybirthday #legend #heavymetal #metal