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Bach tuned his own harpsichords and clavichords and found other people's tunings unsatisfactory; his own allowed him to play in all keys and to modulate into distant keys almost without the listeners noticing it. Also, Bach required all the major thirds to be sharper than pure which is in any case virtually a prerequisite for any temperament to be good in all keys.

Bach used instruments in the motets only for doubling the voices. In many of Bach's cantatas, the opening chorus includes the chorale melody complete in one voice whioe the other voices and instruments pursue the main concerted idea of the movement.

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14y ago

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