This piece is a Choir arrangement version of India chanting. Each vocal part have different chanting and making sounds of instruments on their voice. Also, if you listen the melody, we can feel that the melodic types are in India. I love this song because it is really interesting that choir sing their notes and chanting in India style. 

Link: https://www.youtube.com/watch?v=1YpNpZWjIgM&t=34s