: Enharmonic reinterpretation & chromatic sequences

(m. 70-ish): Arrives in G major (relative major of E minor) — surprise: B section is actually a minuet-like in G major! So B is ternary within ternary : B1: E major/minor → B2: G major (like trio) → B3: back to E minor.

Would you like a (chord symbols and Roman numerals) for a specific section of this Impromptu?