| http://www.w3.org/ns/prov#value | - So, I would offer three examples: the Anna Magdalena Book with the family tunes and studies, including the work of other composers; the Bach family annual gatherings making up those quodlibets; and the keyboard works which are mostly in his students's hands (except for the publications), subject to all manner of changes, like the organ piece, BWV 131a, Aus der Tiefe.
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