If you are interested in the magic of fast octaves, have a look at this performance by Rubenstein of the A-flat Polonaise. This is a rare opportunity to observe octave shaping in action. Notice how he starts the passage using two hands (saving himself?) then switches to octaves. Notice also how in the first section, E-major, he starts out on the white key and moves in to the black keys in a continuous circular motion. Though difficult to see in speed, there is a slight under shape from the low B back up to the starting E. The movement is continuous and rounded, no sharp edges, and describes something like an ellipse. (I recommend fingering quick octaves one/five.) The shape is reversed when the passage repeats in E-flat.I heard him play at Carnegie Hall and again later for a pension benefit concert with the New York Philharmonic. On both occasions the audience would not let him leave without playing the Polonaise, which was a signature piece.
Rubenstein Plays Chopin's Polonaise in A-flat
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