"One OK Rock" One Ok Rock, stylized as ONE OK ROCK is a Japanese rock band formed in Tokyo, Japan. The band currently consists of Takahiro Moriuchi, Toru Yamashita, Ryota Kohama, and Tomoya Kanki. World-Wide Known Band, especially in America (US), Europe, China, etc. 

http://jame-world.com/us/articles-124276-one-ok-rock-at-the-warfield-san-francisco.html 

http://www.jame-world.com/uk/articles-124615-one-ok-rock-ambitions.html

One OK Rock - YouTube 1 - Concert (Millions of people) 

One OK Rock - YouTube 2

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http://www.jame-world.com/uk/articles-124615-one-ok-rock-ambitions.html

ONE OK ROCK take on the world with the international edition of their latest album.

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Its on iTUNES and Spotify. I have downloaded the entire Album!! 
I love the song "I was King" and "American Girls" 
The love story, "Wherever you Are" is awesome too!! You should listen to them. 
https://www.youtube.com/watch?v=NzzZ-9TE5L4
Downloaded all their songs and playing over and over!! 
Love it. I love the their "love songs" and the recent ones too. 
Purchased and Downloaded their latest Album "Ambition".
And two singles: "Wherever you are" and "Heartache"!!
There is an upcoming concert in US.

Thanks for sharing!!
i just found out that they will be coming to my city this summer ... thinking about going, but i know virtually nothing about them ... what is their claim to fame per say? 
I love them so much. I think I've purchased all their songs lmao they are so versatile, you can't get bored with their music 
loved them since I first heard their song the Beginning through Rurouni Kenshin! Their concerts are awesome btw! They're really great live  :)
I used to love them so much but since they started to get more recognition internationally, their style has changed a lot and I think their songs are a bit too generic now..

I like their old music, don't know about new, but sometimes I wonder what's the point of listening to american rock from Japan, when I could just listen to american rock.

You should try Babymetal,my first story,spair, they are my favourite!!

I recommend SPYAIR too!!!. They are awesome!!!

I love ONE OK ROCK too <3

Are they your first intro to J-rock?

If so, they there bands as well: Uverworld, Flow, Scandal, Aimer (solo singer - closer to ballad rock), and Luck Life.

There's more... but those are the ones I can think of the top of my head. If you like ONE OK ROCK more recent songs (from latest album), maybe Aimer, Scandal and Flow would suit your taste better.