The Nocturne op. 37 no. 2, composed in 1839, is a perfect example of the rich, pearling cascades of thirds and sixths that keep Chopin's piano works at the top of the popularity list and as beloved today as in his time. Although no autograph of op. 37 has survived, an engraver's examplar for the 1840 edition from Breikopf & Hartel is extant, and was corrected by Chopin himself. We have of course consulted this source for our Urtext edition.