A couple of months ago I was in a fiddle workshop given by Billy Mathews in Urbana, Il. This A-tune was the first of 9 tunes he taught. It works pretty well on banjo, and is nice and easy on the fiddle. He told us that an "apple knocker" was a term for a person who picks the apples, and that there is another tune in D by the same name (different tune). I recorded the banjo first so that I wouldn't break rhythm on the fiddle.