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? 
Nightwish:  The band was formed in 1996 by lead songwriter and keyboardist Tuomas Holopainen, guitarist Emppu Vuorinen, and former lead singer Tarja Turunen.
i don't know