 Okabe did not want to use traditional lyrics , as he felt they would clash with the design of the world in the game , and wanted to use a variety of languages to represent the open nature of the game 's world . He also did not want easily recognizable lyrics to be sung in the background while the characters were speaking , and for any noticeable words to instead evoke emotions in the player . Evans only knew English , Japanese , and French when she began the project ; she listened to the other languages on YouTube to learn the rhythms and sounds of the languages and then mixed and changed them . Okabe largely allowed Evans to decide how to integrate the lyrics with the early forms of the songs , and as he usually did not know where the songs would be used in the game gave her only light direction as to the emotional tone for the songs . The composers often would modify the songs in later revisions to follow how Evans had sung for that song . 
