Yesterday I discovered the musical ensemble "Kineie Nami Shachu" that plays covers of popular Nico Nico Douga songs on traditional instruments. They're quite good, but I also find it very funny. I added links to the traditional non-traditional versions.
"Touhou Undefined Fantastic Object ~Fires of Hokkai~ in Traditional Japanese Instruments" (Watch on YouTube)
Probably my favorite: Hannya Shingyou