Koji Hajima is an orchestral conductor for Square Enix. He served as the primary conductor for a number of soundtracks and orchestral pieces across the series. On September 28th 2005, Hajima conducted the orchestra and Nobuo Uematsu's band, Black Mages, in the Final Fantasy VII: Advent Children version of Uematsu's One-Winged Angel to create Advent: One-Winged Angel.