What's going on functionally/structurally in these four bars of Rachmaninoff's 3rd piano concerto?
From Rachmaninoff's 3rd piano concerto 1st movement 2nd subject:
I've been trying to understand what's going on structurally in this passage but I'm having trouble figuring out what's going on. In the picture I've presented my chord analysis. In particular I don't understand what he's doing in the red section of the image. What I'm thinking is he's just treating D as borrowed "extension" of I(63) and then walking down to ii and then slowly back to V? Can anyone help me understand what's going on here?
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I analyze this, broadly, as
I | V/ii | ii | V
In more detail:
m1: I I[6-4] I(over CPT) ii?[4-3]/(V/ii)(from G minor)
m2: V/(V/ii) c.t.?(over PT) V[6-5]/ii V7/ii
m3: ii V7/(V/ii) ii[6-5] V/V
m4: c.t.?7 V ii[4-3] V[6-5]
CPT = chromatic passing tone
c.t.? = "common-tone diminished chord": see: A chord progression from Leavitt: how to analyze it correctly
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