グループ・サウンズ
In 1990, the Japanese subsidiary of Tower Records defined J-pop as all Japanese music belonging to the Recording Industry Association of Japan except Japanese independent music (which they term "J-indie"); their stores began to use additional classifications, such as J-club, J-punk, J-hip-hop, J-reggae, J-anime, and Visual kei by 2008, after independent musicians started to release works via major labels. Ito Music City, a Japanese record store, adopted expanded classifications including Group Sounds, idol of the 1970s–1980s, enka, folk and established musicians of the 1970s–1980s, in addition to the main J-pop genres.