Sound Horizon is a Japanese musical group with composer Revo (Japanese pronunciation: re̞vo) as the leader. They call themselves the "fantasy band" and have released their works that closely resemble suites.
Sound Horizon began with Revo releasing his music creations on the internet on his website in the late 1990s. In 2001, Sound Horizon participated in Comic Market as part of a dōjin music circle and released their first story CD, Chronicle, an all-instrumental track CD, with occasional narration, background chorus and sound effects. The inclusion of actual singing began from their second release (Thanatos) onwards. Their subsequent works were released at Comic Market and M3.
Sound Horizon's first major release was in 2004, with the album Elysion ~Rakuen e no Zensōkyoku~ (lit. Elysion ~Prelude to Paradise~). Their first maxi-single, "Shōnen wa Tsurugi wo...", which was released in 2006, includes "Shūtan no Ou to Isekai no Kishi ~The Endia & The Knights~", the theme for the PlayStation 2 simulation RPG Chaos Wars, and "Kamigami ga Aishita Rakuen ~Belle Isle~", the opening theme for the MMORPG Belle Isle.
Although Aramary was their main female singer through the Elysion album, her departure afterward led Sound Horizon's style to shift quite a bit, to having many vocalists, rather than just one main female one (previously Aramary) and one main male vocalist (Jimang). Revo himself also tended to sing more often in the later albums, beginning with Roman.
On September 3, 2008, Sound Horizon released the album Moira. The album featured Takashi Utsunomiya of TM Network as one of the vocalists.Moira debuted at No. 3 on the Oricon weekly album charts, selling over 45,000 copies in its initial week.
Sound Horizon released the single "Ido e Itaru Mori e Itaru Ido" on June 16, 2010. The single featured guitarist Marty Friedman and Vocaloid Hatsune Miku, along with a beta voicebank for Vocaloid known as "Junger März PROTOTYPE β".
In 2012, Revo began a new project called Linked Horizon, beginning with his work on the score for the Nintendo 3DS game Bravely Default: Flying Fairy, a series of EPs and album. In 2013, Linked Horizon performed the opening themes for the 2013 anime adaptation of Attack on Titan collected on their single "Jiyū e no Shingeki".
In June 2014, it was announced that Revo would also be composing the opening theme of Sailor Moon Crystal, "Moon Pride".