Sphere (スフィア, Sufia?) is a J-pop idol unit made up of voice actresses who are all managed by Sony Music Entertainment, under the Lantis music label in the Music Ray'n subdivision of GloryHeaven. The group debuted in April 2009 releasing their first single "Future Stream". As all four are voice actresses, their music is frequently featured as tie-ins to a variety of anime series, including Hatsukoi Limited, Sora no Manimani, and Ichiban Ushiro no Dai Maō.
Sursă: Wikipedia engleză