Why, why, O Lord . . .

Maybe not the greatest 25 seconds (from about 2:26 to 2:51) of singing I've ever heard, but I can't think of anything any better.

The lyrics translate as:
I lived for my art, I lived for love,
I never did harm to a living soul!
With a secret hand
I relieved as many misfortunes as I knew of.
Always with true faith
my prayer
rose to the holy shrines.
Always with true faith
I gave flowers to the altar.
In the hour of grief
why, why, o Lord,
why do you reward me thus?
I gave jewels for the Madonna’s mantle,
and I gave my song to the stars, to heaven,
which smiled with more beauty.
In the hour of grief
why, why, o Lord,
ah, why do you reward me thus?
(http://classicalmusic.about.com/od/opera/qt/vissidartelyric.htm)