From www.mutopiaproject.org

The Seasons, Op. 37a, is a set of twelve short character pieces for solo piano by the Russian composer Pyotr Ilyich Tchaikovsky. Each piece is the characteristic of a different month of the year in Russia. The work is also sometimes heard in orchestral and other arrangements by other hands. Individual excerpts have always been popular – Troika (November) was a favourite encore of Sergei Rachmaninoff, and Barcarolle (June) was enormously popular and appeared in numerous arrangements.
The above text from the Wikipedia article "The Seasons (Tchaikovsky)" text is available under CC BY-SA 3.0.