Which term refers to performing music "with grace"?

The term that refers to performing music "with grace" is indeed "con grazia." In musical terminology, "con grazia" instructs the musician to play with a gentleness and elegance, creating a sense of gracefulness in the performance. This phrase evokes a refined and flowing manner of playing, often characterized by a light touch and smooth passages.

The other terms provide different expressive instructions. "Con fuoco" means to play with fire or passion, suggesting a vigorous and intense style. "Con brio" indicates a lively and spirited manner, focusing on energy and vivacity in the performance. "Con moto" translates to "with movement," encouraging a sense of motion and an animated approach to the tempo. Each of these terms contributes to the expressive palette of music, but "con grazia" specifically captures the essence of playing with grace.