you can access the song from here
http://www.box.net/shared/6b4ny0vd5f

i just can identify the singer saying a Hallelujah sometimes but
that says in gregorian and opera style

the ID3 tag says it is Hallelujah by iL Divo from promise album but i think it is not when i look at http://lyricstranslate.com/en/halleluia-hallelujah.html

any help is appreciated