I don't try to learn knucklebusters any more, I'm more interested in songs and melodies but I still love to hear them. One in particular being Bensusan's "Le Lac de Abbesses" which is also very musical. Two that I still play are Kottke's "Stealin'" (which contains a bit of Doc's Guitar) and Fahey's "Last Steam Engine Train" played at bat out of hell speed.

Frankie