Find the error?

You only snuck Blümchen in there for comedic reasons, didn’t you? O_o

Tori Amos (comfortably my all time favourite)
Iron Maiden
Alice Cooper
Edguy
Children of Bodom

Hard to limit to just 5, but let's see.

Iron Maiden
Judas Priest
Deep Purple
Nightwish
Nobuo Uematsu (Obligatory video game music entry)

Leaving so many great bands and artists out though,

1. Mumford & Sons
2. Green Day
3. The Killers
4. Volbeat
5. Adrian Von Ziegler

Honorable mentions: Arctic Monkeys, Guns N Roses, Metallica, Slipknot, Muse, The Strokes, Paramore, Avril Lavigne, Enya, Foo Fighters, Nirvana, Pearl Jam, The Beatles, The Rolling Stones, Jake Bugg, blink-182, Editors, The National, The War on Drugs, Poets of the Fall

Good to see a lot of System of a Down!

Please release new album...

Also I forgot to add Slipknot, I would put them in at 3 or 4. Thanks for reminder Flilix.

In no particular order
Linkin Park
Papa Roach
Disturbed
Blink-182
Green Day

No Order:
Pearl Jam, Bob Dylan, The White Stripes, The Beatles, The Hold Steady.

The Beatles, Daft Punk, Michael Jackson (Off The Wall and Thriller), Kanye West (3 first albums), David Bowie.
Personally Daft Punk is by far the best band of the 2000's and 2010's (Discovery is the best dance album of ALL Times and RAM the best album of this decade )
The Beatles revolutionize Pop and Rock Music.
And Michael Jackson is the best entertainer ever and Thriller the best album of the 80's.

Linkin Park
Our Lady Peace
P.O.D.
Drowning Pool
Porcupine Tree
Alice in Chains

Something like...

Muse (easily #1)
The Mars Volta
Bruno Mars
Lady Gaga
The Beatles

Yeah, something like that. The past few months I've been listening to Muse non-stop, so it's a little hard to come up with the others