Jim, I do it ALL THE TIME! I'm creating a kind of Celtic/orchestral rock combo. As you may know, or maybe not, I am a HUGE fan of the band Electric Light Orchestra, and am also a fan of folk music, and I play both--at the same time. ELO sounds great in my folky arrangement with just acoustic guitar and fiddle. There are several that are folky enough already that after my arrangements, people CAN be led to believe they are, in fact, folk. You'd be surprised how well it works!

--Mbo