ONE OK ROCK, 19 February 2017

One Ok Rock, stylized as ONE OK ROCK (pronounced in Japanese as "one o'clock"), is a Japanese rock band formed in Tokyo, Japan in 2005. The band currently consists of Takahiro Moriuchi (vocals), Toru Yamashita (guitar/leader), Ryota Kohama (bass), and Tomoya Kanki (drums).
The band's name, ONE OK ROCK, comes from "one o'clock", the time that the band used to practice on weekends. They chose to play at one o'clock in the morning because it was cheaper to use the rehearsal space during such hours. However, noticing that the Japanese language made no distinction between R's and L's, they changed "O'CLOCK" to "O'CROCK" (or "O'KROCK"), which was then separated to become "OK ROCK". In addition, ONE OK ROCK's name can be expressed as "10969" (one-o-ku-ro(ku)-ku).