Keyboardist Tuomas Holopainen of Finnish symphonic metallers NIGHTWISH was interviewed by Joiz prior to the band's June 15 performance at the Greenfield festival in Interlaken, Switzerland. You can now watch the chat below. Holopainen has known NIGHTWISH's current touring vocalist, Dutch singer Floor Jansen, for more than 10 years already, having previously toured with her former band, AFTER FOREVER. Jansen made her live debut as the frontwoman of NIGHTWISH on October 1, 2012 at Showb...