I ran across a classical guitarist that was transcribing Metallica pieces to the guitar. He consistently performs in a catholic church in his videos (or maybe its Lutheran I don't know). Kind of funny.
You also have rodrigo y gabriela which are a couple metalheads turned flamenco players. Not my favorite guitarists but they have some fun stuff.
God Forbids Amish Metalhead to Be Anything But Drummer
Fool wrote
They're not ambitious enough, if accoustic guitar is fine, I'm sure Cellos would be.