Étude Op. 10, No. 8 in F major is a technical study composed by Frédéric Chopin. It has been nicknamed the "Sunshine" etude. This work follows on from No.7 as being primarily another work concerned with counterpoint. In this case, however, the principal melody is in the left hand, the secondary being embedded in the arpeggios of the right hand. As with many of the études, the work is divided into three sections – bars 1-28, 29-60 and 61-95. The right-hand figuration is straightforward with the accent falling always on the first note of each group of four semi-quavers throughout the work. The main difficulty is that they must be played forte and legato at speed, ascending and descending sequentially over the keyboard. Due to the obligation to sustain the left-hand melody somehow whilst still keeping the right hand's figure clear, this presents a great difficulty.