How did Johann Sebastian Bach transform Vivaldi concerti when transcribing them?

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When Johann Sebastian Bach transcribed concerti by Antonio Vivaldi for keyboard instruments, he applied his mastery of counterpoint to transform the original models. Rather than merely copying the scores, Bach refined the music through several specific techniques:12

  • Melodic and Textural Enrichment: Bach sharpened themes melodically and enriched musical textures by adding new melodic entries to contrapuntal passages or creating a more intensive interplay of musical motives.1
  • Structural Adjustments: He altered the design of the musical forms by inserting new material, deleting sections, and adjusting the timing of phrases and entries.1
  • Instrumentation: Bach often adapted these works for harpsichord or organ, emphasizing his priority in establishing the harpsichord as a prominent solo instrument. For example, he famously arranged Vivaldi’s concerto for four violins (Opus 3, No. 10) for four harpsichords (BWV 1065).13

These transcriptions demonstrate how Bach utilized Vivaldi’s imaginative structures while imbuing them with the complex, contrapuntal depth characteristic of his own style.41