Simplify the following text for a Grade 4 native English-speaking person.
Original: Nightwish is a symphonic metal band from Kitee , Finland , formed in 1996 by songwriter and keyboardist Tuomas Holopainen , guitarist Emppu Vuorinen , and former vocalist Tarja Turunen .
Simplified: Tuomas Holopainen came up with the idea . He asked Tarja Turunen to sing and Emppu Vuorinen to play guitar .