Chance Pop Session

Chance: Triangle Session (チャンス　トライアングルセッション, Chansu Toraianguru Sesshon), also known as Chance: Pop Session is a Japanese anime produced by Madhouse studios. The series aired from May 21 to August 27, 2001 and ran for 13 episodes.

Plot
Three young girls—Akari Mizushima, Yuki Aoyama, and Nozomi Kaibara—meet at a concert and set out to follow in the footsteps of their idol, Reika, and become music stars. They enroll in the prestigious music school that produced Reika and are placed in the "S class" due to their potential.