Tchaikovsky · Polka, Op. 39 No. 10 · Children's Album

The dance that withholds its resolution until the final bar

Thirty bars, one Perfect Authentic Cadence. Tchaikovsky's Polka in B♭ major builds through an entire section of dominant prolongation before settling into its single moment of tonic rest.

Study Guide About the Piece

— i —

Section A ends on the dominant every time

The polka theme closes on a half cadence — not a resolution. Both phrase endings (mm. 4 and mm. 7–8) land on V. The music is propulsive from the first bar because nothing has settled yet.

— ii —

Section B is a dominant prolongation, not a departure

Fourteen measures of tritone dyads and chromatic bass descent — all within a single prolonged V of B♭ major. F is never a tonic here. The music is harmonically suspended across the entire middle section.

— iii —

One PAC in thirty bars — and it closes the piece

The only Perfect Authentic Cadence arrives at mm. 29–30: soprano B♭4 over bass B♭2. Everything before it — every half cadence, every chromatic colouring, the entire dominant prolongation — is preparation for this single quiet close.

The structure

Full overview →

A — mm. 1–8

B♭ major

Bright polka theme. Repeated. Both phrases close on a half cadence — the music is open throughout.

B — mm. 9–22

Dominant prolongation

Fourteen bars over F (V). Tritone dyads, chromatic bass descent, forte climax at mm. 21–22. No tonic arrival.

A′ — mm. 23–29

Tonic homecoming

Return of the polka theme at piano. The structural tonic arrival the entire B section was building toward.

Coda — m. 30

PAC

Single bar. B♭ major triad, piano. The only Perfect Authentic Cadence in the piece. The dance is done.

At a glance

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Composer

Tchaikovsky

Pyotr Ilyich Tchaikovsky, 1840–1893.

Collection

Children's Album

Op. 39 — 24 piano pieces (1878).

Key

B♭ major

Two flats. Bright, energetic, dance character throughout.

RCM Level

Level 5

2022 Celebration Series, List B (Romantic).

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