(PWM). Includes Sonata in B-flat minor, Op. 35, composed in 1839, and Sonata in B minor, Op. 58, composed in 1844. Most would agree that the Sonatas are the most challenging pieces in all Chopin's compositions for piano. The posthumously published Sonata in C minor, Op. 4, is published in 00132354. The National Edition of the Works of Fryderyk Chopin Published by PWM Exclusively Distributed by Hal Leonard Corporation Co-Editors Jan Ekier and Pawel...