Dale Carr wrote:

>Almost none - maybe none at all - of Buxtehude's organ music is preserved in
>autograph HSS.
>
We also don't know why it was written down in the first place or by
whom; and most of it survivies in central, not northern, German sources
several decades later. We don't know why it was copied, what use it was
put to, or what sort of changes may have been made. Ibo probably knows
more than anybody at this point, actually.

best,
 stuart

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