Ron is right. It was instrumental folk purists who lamented the selling out of traditional music in the mid 60s by Dylan and other artists who added drums and amplification, but I would say that the Byrds did more to turn on a generation of teens to traditional music in that era than did Pete Seeger. These songs are bedrock, and will bare up under all the modification and instrumentation we can throw at them. The minute they are defined by an instrumental style, they start to wither. We can and should harken back to our earliest accessible forms of the songs, at least to get our bearings, but slavish devotion to those styles breeds imitation in what should continue to be a living, breathing, evolving part of our culture.