Member:
NA- Furthest Shore - keyboards  
NA- Nattvindens Gråt - keyboards  
1996-1997 Nightwish - keyboards, synths, vocals  
1998- Nightwish - keyboards  
1999- For My Pain - keyboards  
2013- Tuomas Holopainen - keyboards  
Studio musician:
1994-1998 Darkwoods My Betrothed - keyboards  
Guest musician:
2001 Sethian - keyboards  
2002-2004 Timo Rautiainen & Trio Niskalaukaus - keyboard  
2003 Kotiteollisuus - keyboard  
2003 Silentium - additional keyboards  
2003 Sethian - keyboards  
2005-2007 Kotiteollisuus - keyboard  
2009-2011 Kotiteollisuus - keyboard  
2013 Kari Rueslåtten - keyboards, piano  


Personal information

Born on: 25.12.1976

Tuomas Lauri Johannes Holopainen (born 25 December 1976) is a Finnish composer known best for symphonic metal music. He has also studied jazz and classical styles, but prefers to be influenced by harmonic film music.

He is best known for being the keyboardist, band leader and main songwriter of Finnish symphonic metal band Nightwish. He has also played in the bands Nattvindens Gråt and Darkwoods My Betrothed. His current side projects are the Gothic metal band For My Pain... and the band of Timo Rautiainen.

Holopainen has written several songs that have been included in movie soundtracks, including recent collaboration with Nightwish bass player, and male vocalist Marco Hietala on "While Your Lips Are Still Red", for the Finnish film "Lieksa!" in 2007. He's also producing Nightwish's own film, Imaginaerum, to be released in early 2012.

source: Wikipedia