Concerto No.5 also differs considerably in the version recorded here,
which is taken from a set of parts copied by Bach's pupil Altnickol.
The Brandenburg version has (in addition to be a number of added ornamental
details) a slightly longer final movement, and, more drastically, a vastly
expanded solo harpsichord episode towards the end of the first movement.
Bach's reason for introducing such a hold-up in the momentum of the music is
not clear, unless he was perhaps showing off the capabilities of the new
harpsichord from Berlin; the shorter version recorded here seems like less
of an intrusion .
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to be continued
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