Prelude in C minor, BWV 999
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The Prelude in C Minor, BWV 999, is, according to its only extant 18th-century manuscript, a composition for lute by Johann Sebastian Bach. In the manuscript, conserved as Fascicle 19 of Mus.ms. Bach P 804 at the Berlin State Library, Johann Peter Kellner wrote the piece down in keyboard notation. The time of origin of the work is not known: possibly Bach composed it in his Köthen period, that is, between 1717 and 1723, or the early years of his ensuing Leipzig period. Kellner's copy was produced after 1727, but before Bach's death in 1750.
The Prelude can be performed as well on a lute as on a keyboard. In the 19th century, it was adopted as No. 3 in the keyboard collection Twelve Little Preludes. It was grouped with Bach's lute compositions in 20th-century scholarship such as the Bach-Jahrbuch of 1931, the Bach-Werke-Verzeichnis and the New Bach Edition. It has been recorded in performances on lute, on guitar, and on keyboard instruments such as piano or harpsichord. In the 21st century, digital facsimiles of Kellner's copy became available on-line, for instance at the Bach Digital website.