Chopin: Nocturne No. 21 in C minor, Op. posth. 1837 [pianist: Dan Kreiger]
Dan Kreiger plays Frédéric Chopin's "Nocturne, Op. posth.1837, in C minor"
available on iTunes
[Artist - Dan Kreiger] [Album - Chopin: The Posthumous Nocturnes]
Recorded by Theo Aronson in 2005.
(sorry, the high C is very out of tune)