BarenTanze - Bartok

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Bartok writes 4321 to be used through out on the repeated eigth notes. Half note=104-120. Can anyone tell me what kind of motion would use here?

Just to start it off, I would say it is finger motion. Bartok recommends in his method book for beginners that repeated notes be played with a horizontal motion of the hand in one place with fingers depressing keys successively. Now that is fine at a slow tempo. But for fast, I recommend a kind of 'running' on the key, involving a pull. Slow and exagerated would be 43 down, 21 up. The fingers are pulling rapidly, the up and down is arm motion. At tempo the arm motion is very slight.