The composers gave her preliminary version of songs and the style they wished the language to be in, such as Scottish Gaelic or French, and she invented the words. In addition to singing, Evans was asked to write her own lyrics in futuristic languages. She was approached a few months after the initial meeting in Autumn 2008 to be the vocalist for the soundtrack. The Monaca team had met her when considering her for a prior project, and Okabe wanted to work with her on Nier. She is the singer for the band freesscape, and had previously worked on video game projects such as the Etrian Odyssey arrange albums. The vocals and lyrics were provided by vocalist Emi Evans (Emiko Rebecca Evans), a singer from England living in Tokyo. Okabe was allowed a great deal of freedom regarding what the music was to sound like game director Taro Yoko's main request was that he use a lot of vocal works. The music was designed for different motifs to appear in various arrangements throughout the soundtrack, and also to convey a sense of sadness even during the 'thrilling' tracks. Some tracks were used in ways that the composers did not envision, such as 'Grandma', which was expected to be used in the prologue of the game but was instead chosen as a boss battle theme.

Often, elements of the game were modified to match the music, rather than the other way around. The music for the game was generally composed legal entirely separate from the development of the game. Okabe was brought onto the project when the concept for the game was first being devised, and worked intermittently on the soundtrack for the next three years until its release. Okabe served as the lead composer and as the director for the project as a whole. The soundtrack to Nier was composed by a collaboration of the studio Monaca, consisting of Keiichi Okabe, Kakeru Ishihama, and Keigo Hoashi, along with Takafumi Nishimura from Cavia, the game's developer. 2.2.2 NieR:Automata Arranged & Unreleased Tracks.2.2.1 NieR: Automata Original Soundtrack.2.1.5 NieR Gestalt & Replicant: Jazz Arrange version.

2.1.4 Piano Collections Nier Gestalt & Replicant.2.1.2 NieR Gestalt & Replicant 15 Nightmares & Arrange Tracks.

2.1.1 NieR Gestalt & Replicant Original Soundtrack.

Nier: Automata Original Soundtrack was highly reviewed by critics, and the album peaked at number 2 on the Oricon charts. Returning collaborators include Keiichi Okabe and the Monaca team on composing duties and Emi Evans on vocals, along with several other singers and lyricists. The soundtrack for Nier's sequel, Nier: Automata, was released worldwide on March 29, 2017. The first three albums sold well enough to be recorded on the Japanese Oricon music charts, reaching number 24 for the original soundtrack, 59 for the first arranged album, and position number 77 for the second. The first arranged album, while also warmly received, was perceived by critics to be weaker than the original and not long enough to stand up to the expectations created by the success of the original. The original soundtrack was highly praised reviewers noted it as one of the best video game soundtracks of the year, praising the originality of the compositions and the beauty of Emi Evans' vocal work. The soundtrack has inspired the release of four official albums by Square Enix-an official soundtrack album and three albums of arrangements-along with two mini-albums included as pre-order bonuses for the Japanese versions of the game and two licensed EPs of jazz arrangements. The music of Nier was composed by Keiichi Okabe with members of his studio, Monaca, Kakeru Ishihama and Keigo Hoashi, and Takafumi Nishimura of Cavia. Nier is an action role-playing video game developed by Cavia and published by Square Enix in 2010.

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