John Boyer a assité à 3 concerts

2007

1 concert

Edguy + Echoes of Eternity + Into Eternity + Gravity
Peabody's Down Under, Cleveland (US)
septembre 2007

2006

2 concerts

Blind Guardian + Leaves' Eyes
Agora Theatre, Cleveland (US)
novembre 2006

DragonForce
Agora Theatre, Cleveland (US)
mai 2006