What is meant by musical "harmony"?

Musical "harmony" refers to the combination of different musical notes sung or played simultaneously, creating a richer sound than a single melody alone. This concept is central to music as it adds depth and complexity. When multiple notes occur at the same time, they can complement each other, producing consonance or dissonance, which contributes to the overall emotion and structure of a piece.

In contrast to the other options, the first choice describes a single entity made up of a sequence of notes, which implies more about melody and structure than harmony itself. The third option focuses solely on a single note, which does not involve the concept of harmony. The fourth choice discusses rhythm and meters rather than the blending of pitches that defines harmonic relationships in music. Thus, the correct answer captures the essence of harmony in its role and function in musical composition.