I'll try to list all the artists I've seen live and enjoyed. Some I enjoyed more than others. Of course I saw many more bands, but most of them I forgot since they weren't that interesting for me or they simply failed.
A
A Life Divided (2011)
Adagio (2010)
Adorned Brood 2x (2008)
Aesthetic Perfection 4x (2010/2011/2012/2013)
Agonoize (2012)
Alestorm 3x (2010)
Amberian Dawn (2009)
Amorphis 6x (2007/2008/2010/2011)
And One 2x (2011/2013)
Apocalyptica (2009)
Arch Enemy (2008)
Arkona (2010)
ASP 4x (2009/2010/2012)
Atrocity (2009)
Autumn (2009)
B
Backyard Babies (2009)
Benighted Soul (2012)
Black Messiah (2010)
Bleach & Chlorine (2010)…