This could be a new thread actually.

How long does a song or musical style have to begone to make it's reemergence a revival? I'd argue that from a culture that relies on example and not written document to carry on a tradition then gone is gone after a few generations. You can't revive what you've never heard.
Bending a new instrument to your use and playing the old music you know on isn't revivalism is it?

Is it revival to play a formerly un accompanied song with guitar or is it revision?

Don