Final answer:
The melody evolving between instruments is best represented through techniques such as motivic development, counterpoint, and orchestration, which include the choice of instruments, dynamics, and expressive techniques to shape the music's narrative and emotional journey.
Step-by-step explanation:
The melody evolving between instruments in a musical composition can be represented in various ways, depending on how the composer wants to express the transition of sound and emotion. There are multiple techniques a composer could use, including but not limited to motivic development, where a musical idea is passed and varied between instruments, or counterpoint, where two or more melodies interact in a complex, yet harmonically complementary manner. Orchestration is another key method, where the composer carefully chooses which instruments play at certain times to bring different colors to the melody as it passes from one instrument to another. The dynamics and expressive techniques recommended for each instrument also play a crucial role in how the melody evolves, adding to the emotional impact and narrative told by the music. Keeping in mind Michael Tilson Thomas' words on 'Music and emotion through time,' it's essential to consider that this evolution of melody goes beyond technical execution. It encapsulates the story and feelings that the music is conveying, as seen in the heroic crescendos or the fearful dissonance in film scores, for instance. In orchestrating a melody's journey across instruments, one effectively shapes the story's tone and the listener’s emotional journey.