This is the "unofficial" ( I can't find enough information one way or the either; but, it does appear to be a decently made fan piece) music video for Florence + the Machine's (that is the stylized band's name they're also known as Florence and the Machine): Seven Devils, of the album Ceremonials. This song was also used (March, 2012) in a trailer for the upcoming second season of HBO's successful Game of Thrones.

This is a very strong, atmospheric, and melodic song-type. It has a hint of rock and roll, but it has hints from the likes of Enya and Evanescence--thus allowing this music to be what it needs to be. It may be hard to define a "region" of music to stick it in. Gaelic ~somewhat~, chanting type music may be the closest you get at most points. Paul Epworth helps define the "Machine" with Isabella Summers also helping a little plus many others (writing for the most part, with Paul and Florence doing most of it), all on this album: Ceremonials.

PS-If others know more about them that I don't (like more tags that they should be under), please leave a small conversational piece below of course and I will add as needed. Thank you.

The main members of the group are (an, originally, English/U.K. band--the early albums being lighter the newer being darker):

Florence Welch
Robert Ackroyd
Christopher Lloyd Hayden
Isabella Summers
Tom Monger
Mark Saunders


Lyrics (they may be incorrect in some spots, but these seem to be the most accurate I could find. If you find better send a comment to me @kceaton1, copy this video's address above and paste it into the top, then explain what you need to and send any improvements or changes you have found that are official or have been certified in some manner...BTW almost all the lyric sites have "crowd" rather than "crown", but if you read a lot of the forums you realize that most people do not think that is the correct lyric; so I'll keep this for now):
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Holy water cannot help you now
A thousand armies couldn’t keep me out
I don’t want your money
I don’t want your crown
See I’ve come to burn
Your kingdom down

Holy water cannot help you now
See I’ve come to burn your kingdom down,
and no rivers and no lakes can put the fire out
I’m gonna raise the stakes, I’m gonna smoke you out

Seven Devils all around me
Seven Devils in my house
See they were there when I woke up this morning
I’ll be dead before the day is done

Seven Devils all around you
Seven Devils in your house
See I was dead when I woke up this morning
I’ll be dead before the day is done
Before the day is done

...and now all your lies will be exorcised,
and we will find your sayings to be paradox,
and it’s an even sum
It’s a melody
It’s a final cry
It’s a symphony

Seven Devils all around me
Seven Devils in my house
See they were there when I woke up this morning
I'll be dead before the day is done

Seven Devils all around you
Seven Devils in your house
See I was dead when I woke up this morning
I'll be dead before the day is done
Before the day is done
Before the day is done
Before the day is done

They can keep me out
’Till I tear the walls
’Till I save your heart
and to take your soul
For what has been done
Cannot be undone
In the Evil's heart
In the Evil’s soul

Seven Devils all around you
Seven Devils in your house
See I was dead when I woke up this morning
I'll be dead before the day is done
Before the day is done
------

http://en.wikipedia.org/wiki/Florence_and_the_Machine