Well… So far, I’ve been to over 400 shows, and I have seen a little under 300 bands (seen several bands several times). Since I’m a bit of a nerd, I’m keeping a log of them as well. Here’s an alphabetized list of them all (without duplicates):

1349
Aborted
Absu
Acidiun
Alestorm
Alice Cooper
All That Remains
Alonzo
Always War
Amaranthe
Amaxa
Amon Amarth
Amorphis
Anaal Nathrakh
Arkona
Arsenite
Arsis
Ashtray Electric
Asphyx
Assblaster
Asta Kask
At the Gates
Avenged Sevenfold
Behemoth
Benediction
Between the Buried & Me
Birdflesh
Black Magic Fools
Black Sabbath
Bleed From Within
Bloodshot Dawn
Bob Log III
Bolt Thrower
Borknagar
Bring Me the Horizon
Browsing Collection
Brutal Truth
Bullet For My Valentine
Caliban
Calm
Cannibal Corpse
Captain Black Beard
Carcass
Carubine
Cavalera Conspiracy
Children of Bodom
Civil War
Coldspell
Constrain
Convivium
Cradle of Filth
Crashdïet
Crazy Lixx
Crossholder
Crowdless
Cynic
D-A-D
Dark Angel
DeathDestruction
Decapitated
December Streets
Def Leppard
Deformatives
Deftones
De Lyckliga Kompisarna
Desolator
DevilDriver
Diabolical
Dismiss Connection
Disturbed
DMTMC
Doomsday Disciples
Dying Fetus
Electric Wizard
Emperor
Enemy Is Us
Engel
Enslaved
Entombed
Entrapment
Ereb Altor
Esoteric
Europe
Evergrey
Exodus
F.K.Ü.
Facebreaker
Fear Factory
Finntroll
Flogging Molly
Gamma Ray
General Surgery
Ghost
Glorior Belli
Goatsodomizer
Gojira
Gorgoroth
Gorguts
Grand Solution
Grave
Graveworm
Graveyard
Grimner
Grá
Hammercult
Hatebreed
He’s A Killer
Heaven Shall Burn
Helltrain
Hoffmaestro & Chraa
Horisont
Hour of Penance
Hypocrisy
Iced Earth
Ihsahn
Ill Niño
Imber
Immolation
Imperial State Electric
Inaüdible
Incarnit
In Flames
Inside A Sinner
In Solitude
Iron Maiden
Irrbloss
Isole
Janie & The Beard
Jungle Rot
Kadavar
Katatonia
King Diamond
Knickedickz
Kongh
Kreator
Kylesa
Lamb of God
Legion of the Damned
Leprous
LifeR
Lillasyster
Loch Vostok
Lord Shades
Lost Souls
Lou Siffer & The Howling Demons
Macabre
Machine Head
Manilla Road
Marduk
Marilyn Manson
Mark Haze
Mass Distraction
Massdistraction
Mass Murder Agenda
Master
Melechesh
Mephorash
Meshuggah
Methoxide
Millencolin
Misery Index
Misfits
Monster Magnet
Morbid Angel
Mother of God
Motörhead
Mustasch
Månegarm
Naglfar
Napalm Death
Neaera
Netherbird
Nifelheim
Nightwish
Nile
Norrköpings Symfoniorkester
One Hour Hell
Opeth
Optimus
Ordos
Pain
Pebbleman
Periphery
Plantera
Procession
Pro Pain
Raised Fist
Raubtier
Raw Diamond
Red Fang
Reenact
Rob Zombie
Rompeprop
Sabaton
Saint Deamon
Sanctrum
Satans Kadaver
Satyricon
Scandinavian Hateland
Scar Symmetry
Scrapheap Symphony
Scream Queens
Septekh
Septicflesh
Sepultura
Seventribe
Shaker
Shining
Sicwoid
Sideburn
Silent Witness
Skiller
Skitarg
Slayer
Slipknot
Snowy Dunes
Sodom
Soilwork
Solewire
Sonata Arctica
Sonic Syndicate
Sordid Flesh
Soreption
Soulfly
Soundgarden
Space Unicorn on Fire
Stallion Four
Status Quo
Stench
Sterbhaus
Suicidal Angels
Summoned Tide
SYN:DROM
System of a Down
Taiwaz
Tennessee Drifters
Testament
The Beef
The Black Dahlia Murder
The Devin Townsend Project
The Dillinger Escape Plan
The End of Grace
The Kristet Utseende
Thell Barrio
The Loudest Silence
ThemLegs
The Ocean
The Spin
Thine Eyes Bleed
Three Days in Darkness
Thyrfing
Tombstone Pete
Tormention
Torture Division
Trivium
Tsjuder
Turisas
Twisted Sister
Usurpress
Vader
Vapenlicens
Vengha
Vietcong Pornsürfers
Vildhjarta
Volbeat
Volturyon
Vomitory
Von Hertzen Brothers
Vörgus
Warheim
Watain
Weeping Willows
When Karma Sleeps
Wornout

Edit: Forgot a few, hadn’t logged the bands I’ve seen since beginning of august this year – they’re now listed below:

One Hour Hell
Misery Index
Skitarg
Kreator
Imber
Steel Panther
The Agonist
Vader
Arch Enemy
Volbeat
Opeth
Slayer
Heaven Shall Burn
Airbourne
Abramis Brama
Michael Monroe
Skid Row
Doro
Dimmu Borgir
Powerwolf
Watain
Inaüdible
Murdering Murders
Paranorm
LifeR
Die Hard
Eterno
Vanity BLVD
Loch Vostok
Ravenblood
Assblaster
Summoned Tide
Sectu
Mephorash