Can you help me find a particular piece of music?

Several years ago I heard a piece on NPR (probably Performance Today) where someone had combined “Ave Maria” and “Addagio for Strings”. It was a haunting performance but I have not been able to relocate it. I looked on the PT website with no success, I am not even sure if this is where I heard it but thought I would check. Is anyone familiar with this piece or have any idea where and/or how to find a version?