Etude in Thirds [Chopin]

Étude Op. 25, No. 6, in G-sharp minor, is a technical study composed by Frédéric Chopin focusing on thirds, trilling them at a high speed. Also called the Double Thirds Étude, it is considered one of the hardest of Chopin's 24 Études, ranking the highest level of difficulty according to the Henle difficulty rankings. To orchestrate this wonderful piano showpiece, Nathan uses an unusual orchestration, that of 2 Piccolos and 2 Flutes, along with 2 Ob, 2 Cl, Bs. Cl, 2 Bsn, 4 Hn, 2 Tbns, Timp, 1 Perc, Hp, Cel, and Strings.