Member:
1994-2005 Orphanage - vocals  
1999- Kutschurft - drums (as Dr. Ranzzz)  
2002-2008 Pleurisy - vocals  
2011- Celestial Season - vocals  
Live musician:
2007 After Forever - vocals  
Guest musician:
1997 Within Temptation - vocals  
1998 Ayreon - vocals  
2002 Delain - vocals  
2006 Delain - vocals  
2007 Delain - vocals  
2008 Within Temptation - vocals  
2008 Xystus - vocals  
2010 ReVamp - vocals  
2012 Marywine - vocals  
2014 Delain - backing vocals