Nocturne No.14 in F-sharp minor Op.48 No.2:
Composed by Frédéric Chopin in 1841, published in dedication to Mademoiselle Laure Duperré.
There are two things about the middle section :
1) it is in Db major
2) like the middle section of op.48 No.1, it is slower than the rest of the nocturne (molto piu lento), which is not the usual organization of a nocturne (slow-fast-slow)
The midi is generated based on a concert performance by Artur Rubinstein.
Midi File: NocturneNo14_fsharp_minor_op48-2.mid
Sheet File: NocturneNo14_fsharp_minor_op48-2.pdf