What is the primary difference between "tune" and "melody"?

The primary difference between "tune" and "melody" lies in the nuanced definitions of both terms. A tune can be understood as a specific sequence of pitches that has a distinct, recognizable character. It may refer to both instrumental and vocal contexts. The term "melody," on the other hand, refers more broadly to the main musical idea that emerges from those pitches, often encompassing elements such as rhythm, expression, and additional contextual significance within a piece of music.

This distinction highlights that while a tune is a straightforward sequence, a melody encompasses more than just the notes; it embodies the essence of the musical phrase and its emotional or thematic resonance in a composition. The other options contain misconceptions about the terms and their applications in music, focusing on factors that do not accurately reflect their definitions or relationships.