Final answer:
The gradual increase in volume from soft to loud at the end of the piece is known as a crescendo, which adds dramatic impact to the music.
Step-by-step explanation:
In the rendition of Mido Mountain featured in the Listening Guide, the ending of the piece includes a gradual increase in volume from soft to loud, which is called a crescendo. This term is derived from the Italian language and is used in music to indicate a passage that progressively increases in loudness, often leading to a climax or peak in the volume. A crescendo can significantly affect the emotional impact of a piece, adding drama and intensity.
For example, in the context of the excerpts provided, we see the use of volume to enhance the storytelling. Whether it's the sound of the wind as it "whistles into the caves and cracks" or the musical score in a movie that amplifies from a soft melody to a thunderous harmony, the technique accentuates the narrative. The crescendo creates a bridge between the visual and auditory experiences, making moments more poignant and powerful.