Thomas "Hacky" Hackmann


Studio musician

1995 Gamma Ray - backing vocals  
1998-2014 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