Marco Hietala is a member of a band that was formed when? 
Marco Hietala:  Internationally, he is most known as the current bass guitarist, male vocalist and secondary composer to Tuomas Holopainen, of the symphonic metal band Nightwish. Nightwish:  The band was formed in 1996 by lead songwriter and keyboardist Tuomas Holopainen, guitarist Emppu Vuorinen, and former lead singer Tarja Turunen.
1996