Nuance can be an uncountable, abstract noun denoting a quality as well as a countable one, denoting one or many examples or expressions of that quality.
In a biography of the great French actress Simone Signoret, her performance in the 1980 film Chère inconnue is described:
Signoret plays this complex role with considerable nuance. She can be full of anger…, she can be bold and assertive, but she can also be consumed by nervousness and timidity. — Susan Hayward, Simone Signoret: The Star as Cultural Sign, 2004.
After establishing the broad emotional range of the role, the author then discusses the subtle touches of gesture, voice, and facial expression that made for a very nuanced performance — in my opinion, one of her best.
Chopin is noted for his nuanced dynamics, which many attribute to the poor health that robbed him of the physical strength to play sustained fortissimo passages. He thus narrowed the dynamic range of many of his solo compositions such that subtle distinctions in volume, color, and attack, i.e., nuances, became important, unlike, say, most of Liszt or the later Scriabin when he stopped imitating Chopin. But not every piano is capable of rendering such nuance:
However, on this type of piano it is impossible to obtain the subtle nuances with movements of the wrist and forearm, as well as of each individual finger. These nuances – I've experienced them as Chopin's on his beautiful piano, with its touch so close to that of the Viennese instruments. — Jan Marisse Huizing, Frédéric Chopin: The Etudes: History, Performance, Interpretation, 2015.
THE Viennese instrument is a Bösendörfer, prized among professionals for its responsive touch. The top of the line model, the Imperial, can be yours today for a mere €169,920.
Thus whether within a broad range as in Signoret’s or a narrow one as in Chopin’s dynamics, nuance — and nuances — are a crucial component of artistic expression, perhaps the most important one.
If you're still skeptical, listen to any Aretha Franklin hit and pay attention to what she does to every note or how she changes the rhythm. Then ask yourself why.