Question: Tuomas Lauri Johannes Holopainen, is a Finnish songwriter, multi-instrumentalist musician (but mainly keyboardist) and record producer, best known as the founder, leader, keyboardist and songwriter of symphonic metal band Nightwish, formed in which year? 
Sentence (from "Nightwish"): In 2001, Vänskä was replaced by Marco Hietala, who also took over the male vocalist role previously filled by Holopainen or guest singers.
Relevant evidence: No