While trawling the net for weirdness I came across the work of Apocalyptica, a four-piece cello orchestra who cover songs by Metallica, Pantera and other sweaty metal bands. Sounds like a dreadful idea, but it works rather well. Their version of Nothing Else Matters is quite gorgeous and comes highly recommended. Use the Google method for Apocalyptica and look toward the bottom of the first page of search results.
(I don’t want to post a direct link for fear that Lars Ulrich will come round and bash my head in with his drumsticks. I know it’s only a cover version, but still – why run the risk?)
Or, you know, you could actually buy a CD. Just ask at your local crazy-batshit music retailer.