Piano Sonata in C-sharp minor (Tchaikovsky)
2nd Piano Sonata
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Russian composer Pyotr Ilyich Tchaikovsky wrote his Piano Sonata in C♯ minor in 1865, his last year as a student at the St Petersburg Conservatory. The four-movement work was not published during the composer's lifetime, but Tchaikovsky did transpose, adapt and orchestrate its third movement to create the scherzo of his Symphony No. 1 in G minor, Op. 13.

The sonata itself was eventually published in 1900 by P. Jurgenson but with the misleading posthumous opus number "80"; it is more properly catalogued in the 2002 Tchaikovsky Handbook as "TH 123."[1]
The four movements are:
- Allegro con fuoco (C♯ minor, 4
4) - Andante (A major, 3
4) - Allegro vivo (C♯ minor, 3
8) - Allegro vivo (C♯ minor, 2
2)
The sonata ends in the tonic major, in the enharmonic spelling of D♭ major.[2]
Tchaikovsky went on to write a second piano sonata, in G major, in 1878, which was published as Op. 37.