On Tue, 27 Aug 2013, Urs Liska wrote:
Are there any biographical notions that Chopin used that Nocturne
(page 2) as a resource bin for the f minor piano concerto?
Yes there are. I don't know the exact story. I remember having read
somewhere it was written for his sister, as a pre-study for the 2nd
piano concerto. Maybe the complete story can be found somewhere on the
internet.
I think it is interesting to see that the 3/4 theme from the 2nd
concerto in this version of the Nocturne is much more recognizable
than in the better known 4/4 version without those polymetric bars.