What does "alla" or "all'" mean in musical terminology?

In musical terminology, "alla" or "all'" translates to "in the manner of." This term is commonly used to indicate a style or characteristic approach to a particular composition or section of music. For example, "alla marcia" means "in the manner of a march," suggesting that the music should be played with the stylistic qualities of a marching band.

This usage helps performers understand not just the notes they are to play but also the intended expression and character that should accompany those notes. By recognizing "alla" or "all'" as an indication of manner or style, musicians are equipped to convey the correct musical interpretation as dictated by the composer.

Other options do not align with the definitive meaning of "alla." For instance, terms related to speed, volume, or key, such as those found in the other choices, do not capture the stylistic nuance that "alla" conveys in musical direction.