Noctave
The piece
It begins in a whisper: the left hand unrolls a long, wide-open broken figure while the right hand sets a short lament above it, sotto voce. The metre then shifts to three beats, the motion quickens step by step, and the tension builds to a passage marked con forza before the opening tempo returns. The final bars, Adagio, leave the minor mode behind and close in C-sharp major. This version follows the first Leipzig edition.
Most of the work lies in the left hand: it plays nearly two thirds of the notes and every leap of an octave or more found in the score, 151 of them. These arpeggios span more than the hand can cover, so treat each one as a single wrist motion pivoting on the thumb, and let the pedal hold the bass notes your fingers cannot. In the middle section, repeated notes and a gradual climb call for a carefully measured crescendo; save something for the con forza peak. Four sharps plus many accidentals become easier to read once you have identified the left-hand harmonies.