Supercell- Japanese doujin music group

Supercell is a Japanese doujin music group led by a songwriter, Ryo, which formed in 2007. The music group first used the voice synthesizer Hatsune Miku to perform their music, up until they wished to introduce a live singer.Supercell made a transition to vocalist Nagi Yanagi with their debut single "Kimi no Shiranai Monogatari" (2009). Two more singles featuring Nagi were released in 2010, followed by Supercell's second album Today Is A Beautiful Day (2011), which was Yanagi's last contribution with Supercell. Following Yanagi's departure, Supercell held auditions for new guest vocalists, and two girls were chosen out of about 2,000 candidates: 15-year-old Koeda, Tia and 17-year-old Chelly. Both vocalists sang the music themes for the 2011 anime Guilty Crown, and released their first singles with Supercell in 2011.

SOME OF MUSIC VIDEOS  :

Supercell official website: http://www.supercell.jp/
More information: http://supercell.wikia.com/wiki/Main_Page