Studio musician:
1995 Gamma Ray - backing vocals  
1998 Grave Digger - backing vocals  
1999 Grave Digger - backing vocals  
2001 Grave Digger - backing vocals  
2003 Grave Digger - backing vocals  
2005 Grave Digger - backing vocals  
2007 Grave Digger - backing vocals  
2012 Grave Digger - backing vocals  
2014 Grave Digger - backing vocals  
Guest musician:
1989-1990 Blind Guardian - backing vocals  
1995 Blind Guardian - backing vocals  
2001 Blind Guardian - backing vocals  
2006 Blind Guardian - backing vocals  
2010-2015 Blind Guardian - choir vocals