What term describes a soft, subdued manner of singing or playing?

The term that describes a soft, subdued manner of singing or playing is “sotto voce.” This Italian term literally translates to "under voice," which reflects the technique of performing softly, often creating a more intimate atmosphere in music. It is commonly used in both vocal and instrumental music to instruct musicians to lower their volume, thereby giving a gentle and hushed quality to the performance.

In contrast, other terms specify different dynamics: the term for a soft sound is "piano," which indicates a softer dynamic but doesn’t carry the same connotation of intimacy as "sotto voce." "Mezzo forte" refers to a moderately loud dynamic, which is clearly not subdued, while "fermata" indicates a pause or hold on a particular note or rest, rather than a manner of playing or singing. Understanding these nuances helps in interpreting the expressive capabilities of music.