The 'Orgelbüchlein' (Little Organ Book) by J.S. Bach was intended primarily to serve which purpose?
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A
To teach young organists how to develop chorale preludes and to practice pedal technique
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B
To provide complete sets of chorale settings for Lutheran Sunday services
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C
To demonstrate the capabilities of the new Hamburg organs
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D
To serve as a companion to the Well-Tempered Clavier