This virtuoso etude has been given the nickname ''Black Key Study'' by pianists, since, apart from one single f in M. 66, the right hand does not touch a single white key. This gives the harmony a pentatonic, almost Debussy-an character, and has most certainly contributed to its great popularity. Those who are not ready to tackle the complete volume of Chopin Etudes (HN 124) will be well served by this separate Urtext edition.