What is defined as a sequence of musical notes that is musically satisfying?

A sequence of musical notes that is musically satisfying is known as melody. In music, melody refers to a series of pitches or notes that are perceived as a single entity. This sequence is often what listeners recognize as the "tune" of a piece. Melodies can vary in shape, contour, and range, but their primary characteristic is that they create an enjoyable or memorable musical line that stands out.

Harmony refers to the combination of different musical notes played or sung simultaneously to create chords, which serves as the backdrop for the melody. Rhythm relates to the timing of music—how long notes are held, their placement in time, and patterns in the flow of music. A chord is a combination of three or more notes played together, which contributes to the harmony of a piece but does not embody the concept of a melodic line. Therefore, the definition of a melody aligns exactly with the idea of a sequence of notes that listeners find satisfying, making it the correct choice in this context.