https://soundcloud.com/torururung/sekai-no-owari-rpg-back-vocal
https://soundcloud.com/torururung/sekai-no-owari-present-back-vocal
https://soundcloud.com/torururung/sekai-no-owari-earth-child-back-vocal-1
https://soundcloud.com/torururung/sekai-no-owari-mermaid-rhapsody-back-vocal
https://soundcloud.com/torururung/sekai-no-owari-play-back-vocal
https://soundcloud.com/torururung/sekai-no-owari-hey-ho-back-vocal
에상했다싶이 Hey Ho가 많이 들리고 은근 Earth Child가 신기한게 많이 들리고
Present 후반부 후렴이랑 RPG 후렴 부분에 성악단?목소리 깔리는거 신기해