Op. 1, No. 2 (1863/64).
The Impromptu was composed during Tchaikovsky's years as a student at the Saint Petersburg Conservatory (1863–64), and found its way into print accidentally. Nikolay Kashkin said of this piece: "It was written much earlier and was set down in the middle of Pyotr Il’ich's other Petersburg work, but in this copy-book were some blank pages, on which a new composition [Scherzo á la russe] was written down... When P. I. Jurgenson wanted to print the Scherzo á la russe, [N. G.] Rubinstein took him the whole copy-book, but P. I. Jurgenson did not receive any instructions, and so he had engraved all the pieces he found. When Tchaikovsky saw the proofs of both pieces, at first he was surprised and annoyed that the Impromptu had also been engraved, but afterwards became reconciled to this irreversible fact" .
From: Музыкальное наследие Чайковского (1958),
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