David Grier. Nuff' Said. This is a transcription from his album "Hootenanny" which you should definitely treat yourself to. Check out the genius way he cross-picks the descending line in measure 5 for the B part. It's absolutely beautiful. Grier plays it in open G. He doesn't try to set his strings on fire and neither should you. Cross-picking is hard. Take it slow and easy. He recorded this with a very laid-back feel. Go get the record and you'll see what I mean.