Short answers, pulled from the story.
Happy End is credited as the first Japanese rock band to sing in the Japanese language. Their self-titled debut album was released in August 1970 on the independent label URC.
B'z has sold the most records of any Japanese rock act, with more than 86 million confirmed sales in Japan and an estimated 100 million worldwide. The duo also became the first Asian act inducted into Hollywood's RockWalk.
The first Fuji Rock Festival opened in 1997. At its peak, the festival has drawn crowds of up to two hundred thousand people, making it Japan's largest outdoor music event.
Visual kei is a movement that grew out of Japanese metal and rock bands in the 1980s, drawing visual influence from Western glam rock and glam metal. It was pioneered by bands including X Japan, Dead End, Buck-Tick, D'erlanger, and Color.
Babymetal, a self-described "kawaii metal" act, broke through internationally in 2014 with the viral YouTube hit "Gimme Chocolate!!" They opened for five of Lady Gaga's ArtRave: The Artpop Ball concerts that year, and in 2016 became the first Japanese act to headline London's Wembley Arena.
The earliest Japanese rock bands performed Group Sounds music with lyrics almost exclusively in English. When Happy End released Japan's first Japanese-language rock album in 1970, it sparked public debate with musician Yuya Uchida over whether Japanese-language rock could sustain itself, a question later settled by the commercial success of Happy End's own records.