The Oboe Sonata is very difficult in places, especially the Scherzo. The sorrowful Déploration also requires great skill. To express his mourning for his friend Prokofiev, Poulenc uses the extremes of the oboe. For example, in one passage the player must play a phrase at the bottom of the oboe's range including B flat, the oboe's lowest note, very loudly (fortissimo). The same phrase is then repeated but is marked to be played very quietly (pianissimo). Another obvious example of Poulenc's use of extreme scoring in the first movement is the starting theme which is very high and the player must be skilled to control the notes and keep them in tune.