What term refers to music that is gradually getting softer?

The term that refers to music that is gradually getting softer is "decrescendo." This musical notation indicates a decrease in volume over a specified period, allowing the performer to create a gentle fading effect in the sound. It is an important dynamic marking in music, contributing to the expression and emotional nuance of a piece.

The other terms relate to different aspects of musical dynamics. "Forte" indicates a loud volume, while "crescendo" refers to music that is gradually getting louder. "Accelerando" describes a tempo that is gradually increasing, which is unrelated to dynamics. Understanding these distinctions is essential for interpreting musical scores and performing with the appropriate emotional context.