What expression is associated with lively or energetic playing?

The expression that is associated with lively or energetic playing is "Allegro." In musical terminology, "Allegro" indicates a fast, lively tempo, encouraging performers to play with energy and enthusiasm. This term is commonly used in pieces that require a buoyant and spirited rendition, making it synonymous with joy and excitement in music.

While "Spiritoso" also conveys a sense of spiritedness or vivacity, it specifically refers to the style of performance rather than the tempo itself. In contrast, "Tranquilo" suggests a calm and soothing manner of playing, while "Andante" indicates a moderately slow tempo. Both of these terms direct performances toward a more relaxed or measured interpretation, which differs significantly from the vibrant energy implied by "Allegro." Understanding these nuances helps clarify why "Allegro" is the correct choice when discussing lively or energetic musical expression.