Shounen-tai

Shounen-tai (少年隊 Shōnentai, lit. "Regiment of Boys") is a three-member Japanese idol group under the talent agency Johnny & Associates. They debuted on December 12, 1985. The group lead an annual musical Playzone from 1986 to 2008 for about 957 performances with a total attendance of over 1.38 million people over the course of 22 years. (Source: Wikipedia)