SRS, yes it's a Duo Art playing a roll recorded by Grainger himself. From my very limited knowledge the Duo Art seems to be the Rolls Royce of reproducing pianos. What cracks me up about this clip is that every time the Phantom Grainger hits the sustain pedal, the whole keyboard moves!

Here's another clip of part of the Lincolnshire Posy, folk songs aranged for wind band by Grainger. I have a shrewd idea that Percy would have approved of this particular wind band....

http://www.youtube.com/watch?v=TsUbnscbcJI