J.S Bach Final years and death (1740–1750) (jan 1, 1740 – jan 1, 1750)

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Book II [The second book of the Well-Tempered Clavier]
The two major primary sources for this collection of Preludes and Fugues are the "London Original" (LO) manuscript, dated between 1739 and 1742, with scribes including Bach, his wife Anna Magdalena and his oldest son Wilhelm Friedeman, which is the basis for Version A of WTC II, and for Version B, that is the version published by the 19th-century Bach-Gesellschaft, a 1744 copy primarily written by Johann Christoph Altnickol (Bach's son-in-law), with some corrections by Bach, and later also by Altnickol and others.

From around 1742 he wrote and revised the various canons and fugues of The Art of Fugue, which he continued to prepare for publication until shortly before his death.
The Goldberg Variations, BWV 988, is a musical composition for keyboard by Johann Sebastian Bach, consisting of an aria and a set of 30 variations. First published in 1741, it is named after Johann Gottlieb Goldberg, who may also have been the first performer of the work.

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