I was free form surfing on the web and ran across this. It is a duo of electric guitarists playing "Storm" from the Four Seasons by Antonio Vivaldi. As far as I can tell their guitars are hooked to a synthesizer or sampler, but the skill and sound is amazing. This is from a master class lecture and easy to see the mastery in the performance.
Alexi Laiho, the lead guitarist and vocalist of Children of Bodom and also the guitarist of Sinergy and Kylähullut is accompanied by Roope Latvala. AMAZING!