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?
{'answer': '1996', 'supporting_facts': [['Tuomas Holopainen', 0], ['Nightwish', 1]]}