(October 1, 2011-present)
|Associated acts||Aramary, Jimang, FictionJunction, Yuki Kajiura, Haruka Shimotsuki, Minami Kuribayashi, Azumi Inoue, TM Network, Gerard, Rikki, Rika Fukami, Marty Friedman, Motoi Sakuraba, Siam Shade, Mikuni Shimokawa|
|Past members||See: Sound Horizon band members|
Sound Horizon is a Japanese musical group. They released their first major album in 2004 with Elysion ~Rakuen e no Zensōkyoku~. This album started as the number 14 most popular in Japan. They call themselves a "fantasy band". The band members change according to the song. The composer, Revo is the only person who always participates in the band.