Unfortunately over the years I've lost the memories of some of these shows so I don't remember where and when I saw some bands.... Time to see them again!
This list doesn't mean I'm a fan of all of the bands in this list!
Belgian metalbands = web link, worth checking out!
Last update: Wacken Warm-up Party by Grimm Gent
x... = I lost count
3 Doors Down
3 Inches of Blood
Aborted - http://www.myspace.com/abortedmetal
AbyssFall - http://www.myspace.com/abyssfall x 3
Achyronthia - http://www.myspace.com/achyronthia
After the Burial
Airbourne x 4
Alestorm x 5
Alice Cooper x 4
Alice in Chains
All Shall Perish
All That Remains
Always Fallen - http://www.myspace.com/alwaysfallenmetal
Amenra - http://amenra-official.tumblr.com/
Amon Amarth x 6
Amorphis x 3