Most of Ravel's piano music is extremely difficult to play, and presents pianists with a balance of technical and artistic challenges. Writing of the piano music the critic Andrew Clark commented in 2013, "A successful Ravel interpretation is a finely balanced thing. It involves subtle musicianship, a feeling for pianistic colour and the sort of lightly worn virtuosity that masks the advanced technical challenges he makes in "Alborada del gracioso"... and the two outer movements of "Gaspard de la nuit". Too much temperament, and the music loses its classical shape; too little, and it sounds pale." This balance caused a breach between the composer and Viñes, who said that if he observed the nuances and speeds Ravel stipulated in "Gaspard de la nuit", "Le gibet" would "bore the audience to death". Some pianists continue to attract criticism for over-interpreting Ravel's piano writing.