This set contains Piano Etude Op. 25 No. 4 in A minor sheet music and Piano Etude Op. 25 No. 5 in E minor sheet music.
Piano Etude Op. 25 No. 4 in A minor "Paganini" is a technical study composed by Fryderyk (Frederic) Chopin. It is marked Agitato at the head. The technique explored in this piece is the performance of off-beat staccato chords set against a regular on-beat bass. This is an example of syncopation.
The left hand leaps intervals of up to a tenth (octave plus a third) between the bass and the lowest note of the following chord (and back): this requires a very strong left hand 5th finger.
Very often, the performer is required to hold the uppermost note of the right hand in legato while continuing to play the rest of the chord in that hand (and in the left hand) as staccato: this requires a very strong right hand 5th finger.
The ending is marked Lento and pianissimo and the chords are all on beat in stark contrast with the rest of the piece.
Piano Etude Op. 25 No. 5 in E minor composed by Fryderyk (Frederic) Chopin in 1837. Marking a serious departure in the expected technique developed by piano etudes, Chopin wrote this etude with a series of quick minor seconds that produce slightly dissonant sounds. The effect has earned this piano etude the nickname "Wrong Note".