What is the definition of "poco a poco" in musical terms?

The term "poco a poco" is derived from Italian and translates directly to "little by little." In a musical context, it indicates a gradual change in dynamics or tempo. For example, a passage marked "poco a poco crescendo" would instruct the performer to gradually increase the volume little by little. This concept of gradual progression reflects a technique often used to create tension and enhance emotion in a piece of music.

The other options present definitions that do not accurately represent the meaning of "poco a poco." "Slowly" suggests a more uniform pace rather than a gradual change, "held back" implies a sense of restraint or slowing down without the gradual nuance, and "very fast" is the complete opposite of the concept conveyed by "poco a poco." Understanding these nuances helps performers interpret music more expressively and accurately.