OK, here is one of the biggest bands in recent history (to me at least). This rock band is definitely something special, and you can tell with the energy that they deliver their music.
I have to say that even though they have been around since 2005 I didn't find out about them until I started playing Ryu Ga Gotoku: Ishin (Yakuza: Ishin) early last year. The song used as the intro song was Clock Strikes, and usually I am not swayed by intro songs in games (Japanese or otherwise).
However, there was something unique about this band, and I needed to delve deeper into the music that I heard. (I loved the song so much I would loop the intro scene for the main menu of the game rather than play the game for the first hour ^_^) Once I started down the rabbit hole, I was stuck, and I can say I was happy to be there, the musical flow, and energy is contagious, and enjoyable. I haven't (personally) been able to find an American band that I can just enjoy and get lost in the sensations that the sounds and energy the give off create.
The band itself consists of four members (originally 5, but the other guitarist left the band in 2009) . The band itself consists of Taka (vocals), Toru (guitar), Ryota (Bass), and Tomoya (drums). I can not recommend this band enough, and if you are interested in hearing some songs to whet your appitite, I would say all of them, but to get you started I would say at the least, "Clock Strikes", "Mighty Long Fall", and "Deeper Deeper". Though a good slower, lower energy example would be "Cry Out". And if all that properly whets your appetite for this band here are where you can find info, and more below. I have recently also found out, they have signed with Warner Brothers Record Label, and will be releasing their first album in the west, titled "35XXv" sometime in September, so look forward to it ^_^.
Official Band Page: http://www.oneokrock.com/
Twitter (Band): https://twitter.com/oneokrock_japan
Instagram (Band): https://instagram.com/oneokrockofficial/
Instagram (Taka): https://instagram.com/10969taka/
Instagram (Toru): https://instagram.com/toru_10969/
Instagram (Ryota): https://instagram.com/ryota_0809/
Instagram (Tomoya): https://instagram.com/tomo_10969/