B'z is a famous Japanese hard rock band comprised of Tak Matsumoto (松本 孝弘 Matsumoto Takahiro, Guitar) and Koshi Inaba (稲葉 浩志 Inaba Kōshi, Vocal).
B'z made their record debut with "Dakara Sono Te wo Hanashite (� からその手を離して)" on September 21, 1988. Their first big hit was from the Bad Communication mini album, which was released the next year. They quickly became one of the most popular rock bands in Japan. In their 18 year career span, B'z has had great success with 43 consecutive singles ever since Taiyou no Komachi Angel which topped at #1 on the release day on the Oricon charts. B'z is also the best-selling Japanese musical act in history, with 75 000 000 records sold worldwide.
The origin is yet unknown. On September 22, 2002, B'z played their first live show in the United States, called B'z LIVE-GYM 2002 "Rock n' California Roll". They have also played with overseas musicians such as Aerosmith in the closing ceremony of 2002 FIFA World Cup, Billy Sheehan, Pat Torpey, Brian Tichy from Ball, Fingers from Ball, Steve Vai, and more. Koshi Inaba has a mathematics teacher license, and can speak English. Tak Matumoto won the electronic guitar contest no.5 prize.
I read that in an interview, B'z explained that they originally wanted their name to be A'z, suggesting that they do everything from A to Z, but, when they said it aloud, it sounded uncomfortably similar to AIDS. In order to prevent controversy and misunderstandings, they changed their name to B'z.