From www.mutopiaproject.org
Source: Peters, Herrmann Scholtz, 1900c

Frédéric Chopin's Piano Sonata No. 2 in B-flat minor, Op. 35, is a piano sonata in four movements. Chopin completed the work while living in George Sand's manor in Nohant, some 250 km (160 mi) south of Paris, a year before it was published in 1840. The first of the composer's three mature sonatas, the work is considered to be one of the greatest piano sonatas of the literature.
The above text from the Wikipedia article "Piano Sonata No. 2 (Chopin)" text is available under CC BY-SA 3.0.