It's a spiritual experience.
If, like many of us, you treat Green Day's 'American Idiot' as a hymn book, this is guaranteed to appeal to you.
A group of Gregorian chanters (singers?) put their skill and talent to good use by recording a truly haunting rendition of Green Day's 'Boulevard Of Broken Dreams'.
It's hard to beat the original, but we'd be hard pressed to say we don't think this is pretty damn impressive.
Check out the Gregorian chant version of Green Day's 'Boulevard Of Broken Dreams' below:
And because you now need to compare: