- Allemande
Typical
of all allemandes, this one begins with a short upbeat. It is
written in 4/4 time, and makes frequent use of scalar figures,
so although scalar passages play a major role in the musical fabric
of this partita, they are not necessarily used to draw connections
between movements; here, in the allemande, scales are common practice;
furthermore, given the limited sustaining ability of the harpsichord
and its relatives, scales and scale passages are common in this
era because they allow the composer to sustain a harmony and to
provide connection between otherwise isolated or distant melodic
ideas. [NOTE to all student performers: this is why you have to
practice your scalesbecause they actually do come up in
"real" music!]
Harmonically,
this allemande is relatively straightforward, set clearly in D
major, with the goal of the first half being the establishment
of A major, the dominant key. The second half returns after a
fashion to the tonic key. Nonetheless, Bach includes a few more
colorful chords periodically either to help promote the progress
towards the new tonal goal, or simply for variety. One of my favorites
is the unexpected fully-diminished seventh about mid-way through
the first half (m. 12) which jerks us suddenly into e minor:

Another
pungent passage occurs in the second half, where C major unexpectedly
arrives (in m. 37) and then is left just as quickly a measure
later, with F#s, A#s, and C#s added to the melodic line. While
this propels the music back in the direction of D major (The F#7
chord serves as dominant to B minor, relative minor of D major;
the shift back to D from there is easy), Bach appears to have
just dropped these accidentals on the page with no attempt to
prepare the listener or smooth the transition. But perhaps this
is merely because the bulk of Bachs harmonic choices in
the movement are so tame by comparison.

- Courante
In
Dance and the Music of J.S. Bach, Meredith Little and Natalie
Jenne write:
The
courante in Partita IV (BWV 828) is more problematic than any
of its predecessors. Bach uses the internal shift of 3/2 and 6/4
meters in a subtler and more enigmatic fashion than he did in
BWV 806, 814, and 819. Almost every measure is ambiguous and can
be performed in several different ways, metrically. It is precisely
because the performer must make a specific decision in every measure
that this courante is so fascinating.
Lets
take a look at the score to see what Little and Jenne are talking
about. Ive marked the score to indicate the possibilities
in a few measures.

In
just the first three measures, you can see how, depending on how
the performer accents the notes, any of these measures could be
heard/seen as three groups of 2 (3/2) or two groups of 3 (6/4).
I have marked in orange the 6/4 groupings, and in blue the 3/2.
Sometimes, it appears Bach had one meter in mind for the upper
voices and a different one for the lower.
- Aria
This
joyous, flowing movement is a bit more melodic than the more traditional
stylized dance movements. Still, its hard to imagine a singer
working her way through so much passage work. Perhaps a better
image is a solo flute accompanied by keyboard, lute, or guitar