Nightwish lead vocalist Floor Jansen is recovering after recently undergoing gallbladder removal surgery. The medical procedure, known as a cholecystectomy, was precipitated by a bout of pancreatitis the singer experienced. The surgery led to the discovery of several gallstones. The episode took place in Finland, Nightwish's home base, where Jansen had traveled to rehearse with the veteran symphonic metal band for their upcoming livestream concerts, An Evening With Nightwish In a Virtual World, scheduled for May 28-29. Jansen, who is Dutch, lives in Sweden with her husband, Sabaton drummer...