Bach FAQ 64
What a difficult question – what a following hair splitting. Are all known works of Johann Sebastian Bach preserved?
Firstly: they know of works, which have been existing but they are lost. But, in the last two hundred fifty years they found many of Bach's compositions. Even better: they even found out, that at least one composition is from Bach, just isn't. So, finally the answer is "yes", there are works, which Bach science definitely knows, Bach did compose but they have been lost. Either forever or until the next sensational discovery by a researcher is done or they are found by accident.
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