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Bach, Johann Sebastian : 9 kleine Praeludien Nr.8 a-moll BWV 931

Work Overview

Music ID : 22575
Instrumentation:Piano Solo 
Genre:prelude
Total Playing Time:0 min 50 sec
Copyright:Public Domain

Commentary (1)

Author : Ooi, Kazurou

Last Updated: January 8, 2024
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Note: This article is automatically translated from the original Japanese text. The author of the original work did not supervise this translation.

This is a prelude where improvisation is crucial. While many ornaments are to be played improvisationally, the question then becomes what tempo should be maintained.

In the first beat of bar 4, a G-sharp appears, which is natural as it is the leading tone of A minor. However, a G natural suddenly appears on the second beat. While this is intended to lead to G major, considering the ornaments and such abrupt modulations (which can also be viewed as a harmonic sequence), it is indeed considered that the piece should proceed at an Adagio tempo.

The highest notes in this piece are the F in the fourth beat of bar 2 and the F in the first beat of bar 7. Bars 1-3 present the A minor theme, followed by a descending sequence in bars 4-5. Therefore, gradually decrease the volume, then from bar 6, ascend sharply, reaching the F in the first beat of bar 7 with a crescendo.

In that sense, the F in bar 7 has a higher tension than the F in bar 2.

Once the F in bar 7 is reached, gradually diminish from there, and conclude solemnly with a Picardy third.

Writer: Ooi, Kazurou
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